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| Current File : /home/usr.opt/mysql57/mysql-test/r/greedy_optimizer.result |
drop table if exists t1,t2,t3,t4,t5,t6,t7; create table t1 ( c11 integer,c12 integer,c13 integer,c14 integer,c15 integer,c16 integer, primary key (c11) ); create table t2 ( c21 integer,c22 integer,c23 integer,c24 integer,c25 integer,c26 integer ); create table t3 ( c31 integer,c32 integer,c33 integer,c34 integer,c35 integer,c36 integer, primary key (c31) ); create table t4 ( c41 integer,c42 integer,c43 integer,c44 integer,c45 integer,c46 integer ); create table t5 ( c51 integer,c52 integer,c53 integer,c54 integer,c55 integer,c56 integer, primary key (c51) ); create table t6 ( c61 integer,c62 integer,c63 integer,c64 integer,c65 integer,c66 integer ); create table t7 ( c71 integer,c72 integer,c73 integer,c74 integer,c75 integer,c76 integer, primary key (c71) ); insert into t1 values (1,2,3,4,5,6); insert into t1 values (2,2,3,4,5,6); insert into t1 values (3,2,3,4,5,6); insert into t2 values (1,2,3,4,5,6); insert into t2 values (2,2,3,4,5,6); insert into t2 values (3,2,3,4,5,6); insert into t2 values (4,2,3,4,5,6); insert into t2 values (5,2,3,4,5,6); insert into t2 values (6,2,3,4,5,6); insert into t3 values (1,2,3,4,5,6); insert into t3 values (2,2,3,4,5,6); insert into t3 values (3,2,3,4,5,6); insert into t3 values (4,2,3,4,5,6); insert into t3 values (5,2,3,4,5,6); insert into t3 values (6,2,3,4,5,6); insert into t3 values (7,2,3,4,5,6); insert into t3 values (8,2,3,4,5,6); insert into t3 values (9,2,3,4,5,6); insert into t4 values (1,2,3,4,5,6); insert into t4 values (2,2,3,4,5,6); insert into t4 values (3,2,3,4,5,6); insert into t4 values (4,2,3,4,5,6); insert into t4 values (5,2,3,4,5,6); insert into t4 values (6,2,3,4,5,6); insert into t4 values (7,2,3,4,5,6); insert into t4 values (8,2,3,4,5,6); insert into t4 values (9,2,3,4,5,6); insert into t4 values (10,2,3,4,5,6); insert into t4 values (11,2,3,4,5,6); insert into t4 values (12,2,3,4,5,6); insert into t5 values (1,2,3,4,5,6); insert into t5 values (2,2,3,4,5,6); insert into t5 values (3,2,3,4,5,6); insert into t5 values (4,2,3,4,5,6); insert into t5 values (5,2,3,4,5,6); insert into t5 values (6,2,3,4,5,6); insert into t5 values (7,2,3,4,5,6); insert into t5 values (8,2,3,4,5,6); insert into t5 values (9,2,3,4,5,6); insert into t5 values (10,2,3,4,5,6); insert into t5 values (11,2,3,4,5,6); insert into t5 values (12,2,3,4,5,6); insert into t5 values (13,2,3,4,5,6); insert into t5 values (14,2,3,4,5,6); insert into t5 values (15,2,3,4,5,6); insert into t6 values (1,2,3,4,5,6); insert into t6 values (2,2,3,4,5,6); insert into t6 values (3,2,3,4,5,6); insert into t6 values (4,2,3,4,5,6); insert into t6 values (5,2,3,4,5,6); insert into t6 values (6,2,3,4,5,6); insert into t6 values (7,2,3,4,5,6); insert into t6 values (8,2,3,4,5,6); insert into t6 values (9,2,3,4,5,6); insert into t6 values (10,2,3,4,5,6); insert into t6 values (11,2,3,4,5,6); insert into t6 values (12,2,3,4,5,6); insert into t6 values (13,2,3,4,5,6); insert into t6 values (14,2,3,4,5,6); insert into t6 values (15,2,3,4,5,6); insert into t6 values (16,2,3,4,5,6); insert into t6 values (17,2,3,4,5,6); insert into t6 values (18,2,3,4,5,6); insert into t7 values (1,2,3,4,5,6); insert into t7 values (2,2,3,4,5,6); insert into t7 values (3,2,3,4,5,6); insert into t7 values (4,2,3,4,5,6); insert into t7 values (5,2,3,4,5,6); insert into t7 values (6,2,3,4,5,6); insert into t7 values (7,2,3,4,5,6); insert into t7 values (8,2,3,4,5,6); insert into t7 values (9,2,3,4,5,6); insert into t7 values (10,2,3,4,5,6); insert into t7 values (11,2,3,4,5,6); insert into t7 values (12,2,3,4,5,6); insert into t7 values (13,2,3,4,5,6); insert into t7 values (14,2,3,4,5,6); insert into t7 values (15,2,3,4,5,6); insert into t7 values (16,2,3,4,5,6); insert into t7 values (17,2,3,4,5,6); insert into t7 values (18,2,3,4,5,6); insert into t7 values (19,2,3,4,5,6); insert into t7 values (20,2,3,4,5,6); insert into t7 values (21,2,3,4,5,6); select @@optimizer_search_depth; @@optimizer_search_depth 62 select @@optimizer_prune_level; @@optimizer_prune_level 1 set optimizer_prune_level=0; select @@optimizer_prune_level; @@optimizer_prune_level 0 set optimizer_search_depth=0; select @@optimizer_search_depth; @@optimizer_search_depth 0 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 100.00 NULL 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 100.00 NULL 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t7`.`c71` = `test`.`t6`.`c62`) and (`test`.`t6`.`c61` = `test`.`t5`.`c52`) and (`test`.`t5`.`c51` = `test`.`t4`.`c42`) and (`test`.`t4`.`c41` = `test`.`t3`.`c32`) and (`test`.`t3`.`c31` = `test`.`t2`.`c22`) and (`test`.`t2`.`c21` = `test`.`t1`.`c12`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 39.215192 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 100.00 NULL 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 100.00 NULL 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t7`.`c71` = `test`.`t6`.`c62`) and (`test`.`t6`.`c61` = `test`.`t5`.`c52`) and (`test`.`t5`.`c51` = `test`.`t4`.`c42`) and (`test`.`t4`.`c41` = `test`.`t3`.`c32`) and (`test`.`t3`.`c31` = `test`.`t2`.`c22`) and (`test`.`t2`.`c21` = `test`.`t1`.`c12`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 39.215192 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 Using index 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 100.00 Using index 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 100.00 Using index 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 43.399979 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 Using index 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 100.00 Using index 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 100.00 Using index 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 43.399979 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 100.00 NULL 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 33.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 5.00 Using where 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 6.67 Using where 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 11.11 Using where 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 8.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 5.56 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t4`.`c44` = `test`.`t7`.`c74`) and (`test`.`t3`.`c36` = `test`.`t7`.`c73`) and (`test`.`t6`.`c63` = `test`.`t3`.`c35`) and (`test`.`t5`.`c53` = `test`.`t7`.`c75`) and (`test`.`t3`.`c34` = `test`.`t7`.`c75`) and (`test`.`t4`.`c43` = `test`.`t3`.`c33`) and (`test`.`t6`.`c64` = `test`.`t3`.`c33`) and (`test`.`t7`.`c72` = `test`.`t2`.`c26`) and (`test`.`t7`.`c76` = `test`.`t2`.`c25`) and (`test`.`t6`.`c62` = `test`.`t2`.`c25`) and (`test`.`t5`.`c52` = `test`.`t2`.`c24`) and (`test`.`t6`.`c65` = `test`.`t2`.`c24`) and (`test`.`t5`.`c54` = `test`.`t2`.`c23`) and (`test`.`t4`.`c42` = `test`.`t2`.`c23`) and (`test`.`t3`.`c32` = `test`.`t2`.`c22`) and (`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t1`.`c11` = `test`.`t2`.`c21`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 15.368863 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; c11 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 12 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 100.00 NULL 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 33.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 5.00 Using where 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 6.67 Using where 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 11.11 Using where 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 8.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 5.56 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t4`.`c44` = `test`.`t7`.`c74`) and (`test`.`t3`.`c36` = `test`.`t7`.`c73`) and (`test`.`t6`.`c63` = `test`.`t3`.`c35`) and (`test`.`t5`.`c53` = `test`.`t7`.`c75`) and (`test`.`t3`.`c34` = `test`.`t7`.`c75`) and (`test`.`t4`.`c43` = `test`.`t3`.`c33`) and (`test`.`t6`.`c64` = `test`.`t3`.`c33`) and (`test`.`t7`.`c72` = `test`.`t2`.`c26`) and (`test`.`t7`.`c76` = `test`.`t2`.`c25`) and (`test`.`t6`.`c62` = `test`.`t2`.`c25`) and (`test`.`t5`.`c52` = `test`.`t2`.`c24`) and (`test`.`t6`.`c65` = `test`.`t2`.`c24`) and (`test`.`t5`.`c54` = `test`.`t2`.`c23`) and (`test`.`t4`.`c42` = `test`.`t2`.`c23`) and (`test`.`t3`.`c32` = `test`.`t2`.`c22`) and (`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t1`.`c11` = `test`.`t2`.`c21`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 15.368863 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; c11 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 12 set optimizer_search_depth=1; select @@optimizer_search_depth; @@optimizer_search_depth 1 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 100.00 NULL 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 100.00 NULL 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t7`.`c71` = `test`.`t6`.`c62`) and (`test`.`t6`.`c61` = `test`.`t5`.`c52`) and (`test`.`t5`.`c51` = `test`.`t4`.`c42`) and (`test`.`t4`.`c41` = `test`.`t3`.`c32`) and (`test`.`t3`.`c31` = `test`.`t2`.`c22`) and (`test`.`t2`.`c21` = `test`.`t1`.`c12`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 39.215192 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 100.00 NULL 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 100.00 NULL 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t7`.`c71` = `test`.`t6`.`c62`) and (`test`.`t6`.`c61` = `test`.`t5`.`c52`) and (`test`.`t5`.`c51` = `test`.`t4`.`c42`) and (`test`.`t4`.`c41` = `test`.`t3`.`c32`) and (`test`.`t3`.`c31` = `test`.`t2`.`c22`) and (`test`.`t2`.`c21` = `test`.`t1`.`c12`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 39.215192 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 Using index 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 100.00 Using index 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 100.00 Using index 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 43.400259 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 Using index 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 100.00 Using index 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 100.00 Using index 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 43.400259 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 NULL 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 10.00 Using where 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 5.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 8.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 5.56 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t4`.`c44` = `test`.`t7`.`c74`) and (`test`.`t7`.`c73` = `test`.`t3`.`c36`) and (`test`.`t6`.`c63` = `test`.`t3`.`c35`) and (`test`.`t5`.`c53` = `test`.`t3`.`c34`) and (`test`.`t7`.`c75` = `test`.`t3`.`c34`) and (`test`.`t4`.`c43` = `test`.`t3`.`c33`) and (`test`.`t6`.`c64` = `test`.`t3`.`c33`) and (`test`.`t2`.`c26` = `test`.`t7`.`c72`) and (`test`.`t2`.`c25` = `test`.`t7`.`c76`) and (`test`.`t6`.`c62` = `test`.`t7`.`c76`) and (`test`.`t2`.`c24` = `test`.`t5`.`c52`) and (`test`.`t6`.`c65` = `test`.`t5`.`c52`) and (`test`.`t2`.`c23` = `test`.`t5`.`c54`) and (`test`.`t4`.`c42` = `test`.`t5`.`c54`) and (`test`.`t2`.`c22` = `test`.`t3`.`c32`) and (`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 16.505078 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; c11 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 6 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 NULL 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 10.00 Using where 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 5.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 8.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 5.56 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t4`.`c44` = `test`.`t7`.`c74`) and (`test`.`t7`.`c73` = `test`.`t3`.`c36`) and (`test`.`t6`.`c63` = `test`.`t3`.`c35`) and (`test`.`t5`.`c53` = `test`.`t3`.`c34`) and (`test`.`t7`.`c75` = `test`.`t3`.`c34`) and (`test`.`t4`.`c43` = `test`.`t3`.`c33`) and (`test`.`t6`.`c64` = `test`.`t3`.`c33`) and (`test`.`t2`.`c26` = `test`.`t7`.`c72`) and (`test`.`t2`.`c25` = `test`.`t7`.`c76`) and (`test`.`t6`.`c62` = `test`.`t7`.`c76`) and (`test`.`t2`.`c24` = `test`.`t5`.`c52`) and (`test`.`t6`.`c65` = `test`.`t5`.`c52`) and (`test`.`t2`.`c23` = `test`.`t5`.`c54`) and (`test`.`t4`.`c42` = `test`.`t5`.`c54`) and (`test`.`t2`.`c22` = `test`.`t3`.`c32`) and (`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 16.505078 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; c11 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 6 set optimizer_search_depth=62; select @@optimizer_search_depth; @@optimizer_search_depth 62 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 100.00 NULL 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 100.00 NULL 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t7`.`c71` = `test`.`t6`.`c62`) and (`test`.`t6`.`c61` = `test`.`t5`.`c52`) and (`test`.`t5`.`c51` = `test`.`t4`.`c42`) and (`test`.`t4`.`c41` = `test`.`t3`.`c32`) and (`test`.`t3`.`c31` = `test`.`t2`.`c22`) and (`test`.`t2`.`c21` = `test`.`t1`.`c12`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 39.215192 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 100.00 NULL 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 100.00 NULL 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t7`.`c71` = `test`.`t6`.`c62`) and (`test`.`t6`.`c61` = `test`.`t5`.`c52`) and (`test`.`t5`.`c51` = `test`.`t4`.`c42`) and (`test`.`t4`.`c41` = `test`.`t3`.`c32`) and (`test`.`t3`.`c31` = `test`.`t2`.`c22`) and (`test`.`t2`.`c21` = `test`.`t1`.`c12`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 39.215192 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 Using index 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 100.00 Using index 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 100.00 Using index 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 43.399979 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 Using index 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 100.00 Using index 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 100.00 Using index 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 43.399979 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 100.00 NULL 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 33.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 5.00 Using where 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 6.67 Using where 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 11.11 Using where 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 8.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 5.56 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t4`.`c44` = `test`.`t7`.`c74`) and (`test`.`t3`.`c36` = `test`.`t7`.`c73`) and (`test`.`t6`.`c63` = `test`.`t3`.`c35`) and (`test`.`t5`.`c53` = `test`.`t7`.`c75`) and (`test`.`t3`.`c34` = `test`.`t7`.`c75`) and (`test`.`t4`.`c43` = `test`.`t3`.`c33`) and (`test`.`t6`.`c64` = `test`.`t3`.`c33`) and (`test`.`t7`.`c72` = `test`.`t2`.`c26`) and (`test`.`t7`.`c76` = `test`.`t2`.`c25`) and (`test`.`t6`.`c62` = `test`.`t2`.`c25`) and (`test`.`t5`.`c52` = `test`.`t2`.`c24`) and (`test`.`t6`.`c65` = `test`.`t2`.`c24`) and (`test`.`t5`.`c54` = `test`.`t2`.`c23`) and (`test`.`t4`.`c42` = `test`.`t2`.`c23`) and (`test`.`t3`.`c32` = `test`.`t2`.`c22`) and (`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t1`.`c11` = `test`.`t2`.`c21`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 15.368863 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; c11 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 12 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 100.00 NULL 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 33.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 5.00 Using where 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 6.67 Using where 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 11.11 Using where 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 8.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 5.56 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t4`.`c44` = `test`.`t7`.`c74`) and (`test`.`t3`.`c36` = `test`.`t7`.`c73`) and (`test`.`t6`.`c63` = `test`.`t3`.`c35`) and (`test`.`t5`.`c53` = `test`.`t7`.`c75`) and (`test`.`t3`.`c34` = `test`.`t7`.`c75`) and (`test`.`t4`.`c43` = `test`.`t3`.`c33`) and (`test`.`t6`.`c64` = `test`.`t3`.`c33`) and (`test`.`t7`.`c72` = `test`.`t2`.`c26`) and (`test`.`t7`.`c76` = `test`.`t2`.`c25`) and (`test`.`t6`.`c62` = `test`.`t2`.`c25`) and (`test`.`t5`.`c52` = `test`.`t2`.`c24`) and (`test`.`t6`.`c65` = `test`.`t2`.`c24`) and (`test`.`t5`.`c54` = `test`.`t2`.`c23`) and (`test`.`t4`.`c42` = `test`.`t2`.`c23`) and (`test`.`t3`.`c32` = `test`.`t2`.`c22`) and (`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t1`.`c11` = `test`.`t2`.`c21`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 15.368863 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; c11 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 12 set optimizer_prune_level=1; select @@optimizer_prune_level; @@optimizer_prune_level 1 set optimizer_search_depth=0; select @@optimizer_search_depth; @@optimizer_search_depth 0 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 100.00 NULL 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 100.00 NULL 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t7`.`c71` = `test`.`t6`.`c62`) and (`test`.`t6`.`c61` = `test`.`t5`.`c52`) and (`test`.`t5`.`c51` = `test`.`t4`.`c42`) and (`test`.`t4`.`c41` = `test`.`t3`.`c32`) and (`test`.`t3`.`c31` = `test`.`t2`.`c22`) and (`test`.`t2`.`c21` = `test`.`t1`.`c12`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 39.215192 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 100.00 NULL 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 100.00 NULL 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t7`.`c71` = `test`.`t6`.`c62`) and (`test`.`t6`.`c61` = `test`.`t5`.`c52`) and (`test`.`t5`.`c51` = `test`.`t4`.`c42`) and (`test`.`t4`.`c41` = `test`.`t3`.`c32`) and (`test`.`t3`.`c31` = `test`.`t2`.`c22`) and (`test`.`t2`.`c21` = `test`.`t1`.`c12`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 39.215192 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 Using index 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 100.00 Using index 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 100.00 Using index 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 43.399979 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 Using index 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 100.00 Using index 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 100.00 Using index 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 43.399979 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 100.00 NULL 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 33.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 11.11 Using where 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 6.67 Using where 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 5.00 Using where 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 8.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 5.56 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t4`.`c44` = `test`.`t7`.`c74`) and (`test`.`t7`.`c73` = `test`.`t3`.`c36`) and (`test`.`t6`.`c63` = `test`.`t3`.`c35`) and (`test`.`t5`.`c53` = `test`.`t3`.`c34`) and (`test`.`t7`.`c75` = `test`.`t3`.`c34`) and (`test`.`t4`.`c43` = `test`.`t3`.`c33`) and (`test`.`t6`.`c64` = `test`.`t3`.`c33`) and (`test`.`t7`.`c72` = `test`.`t2`.`c26`) and (`test`.`t7`.`c76` = `test`.`t2`.`c25`) and (`test`.`t6`.`c62` = `test`.`t2`.`c25`) and (`test`.`t5`.`c52` = `test`.`t2`.`c24`) and (`test`.`t6`.`c65` = `test`.`t2`.`c24`) and (`test`.`t5`.`c54` = `test`.`t2`.`c23`) and (`test`.`t4`.`c42` = `test`.`t2`.`c23`) and (`test`.`t3`.`c32` = `test`.`t2`.`c22`) and (`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t1`.`c11` = `test`.`t2`.`c21`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 15.512271 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; c11 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 13 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 100.00 NULL 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 33.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 11.11 Using where 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 6.67 Using where 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 5.00 Using where 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 8.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 5.56 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t4`.`c44` = `test`.`t7`.`c74`) and (`test`.`t7`.`c73` = `test`.`t3`.`c36`) and (`test`.`t6`.`c63` = `test`.`t3`.`c35`) and (`test`.`t5`.`c53` = `test`.`t3`.`c34`) and (`test`.`t7`.`c75` = `test`.`t3`.`c34`) and (`test`.`t4`.`c43` = `test`.`t3`.`c33`) and (`test`.`t6`.`c64` = `test`.`t3`.`c33`) and (`test`.`t7`.`c72` = `test`.`t2`.`c26`) and (`test`.`t7`.`c76` = `test`.`t2`.`c25`) and (`test`.`t6`.`c62` = `test`.`t2`.`c25`) and (`test`.`t5`.`c52` = `test`.`t2`.`c24`) and (`test`.`t6`.`c65` = `test`.`t2`.`c24`) and (`test`.`t5`.`c54` = `test`.`t2`.`c23`) and (`test`.`t4`.`c42` = `test`.`t2`.`c23`) and (`test`.`t3`.`c32` = `test`.`t2`.`c22`) and (`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t1`.`c11` = `test`.`t2`.`c21`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 15.512271 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; c11 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 13 set optimizer_search_depth=1; select @@optimizer_search_depth; @@optimizer_search_depth 1 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 100.00 NULL 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 100.00 NULL 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t7`.`c71` = `test`.`t6`.`c62`) and (`test`.`t6`.`c61` = `test`.`t5`.`c52`) and (`test`.`t5`.`c51` = `test`.`t4`.`c42`) and (`test`.`t4`.`c41` = `test`.`t3`.`c32`) and (`test`.`t3`.`c31` = `test`.`t2`.`c22`) and (`test`.`t2`.`c21` = `test`.`t1`.`c12`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 39.215192 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 100.00 NULL 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 100.00 NULL 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t7`.`c71` = `test`.`t6`.`c62`) and (`test`.`t6`.`c61` = `test`.`t5`.`c52`) and (`test`.`t5`.`c51` = `test`.`t4`.`c42`) and (`test`.`t4`.`c41` = `test`.`t3`.`c32`) and (`test`.`t3`.`c31` = `test`.`t2`.`c22`) and (`test`.`t2`.`c21` = `test`.`t1`.`c12`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 39.215192 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 Using index 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 100.00 Using index 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 100.00 Using index 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 43.400259 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 Using index 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 100.00 Using index 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 100.00 Using index 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 43.400259 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 NULL 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 10.00 Using where 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 5.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 8.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 5.56 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t4`.`c44` = `test`.`t7`.`c74`) and (`test`.`t7`.`c73` = `test`.`t3`.`c36`) and (`test`.`t6`.`c63` = `test`.`t3`.`c35`) and (`test`.`t5`.`c53` = `test`.`t3`.`c34`) and (`test`.`t7`.`c75` = `test`.`t3`.`c34`) and (`test`.`t4`.`c43` = `test`.`t3`.`c33`) and (`test`.`t6`.`c64` = `test`.`t3`.`c33`) and (`test`.`t2`.`c26` = `test`.`t7`.`c72`) and (`test`.`t2`.`c25` = `test`.`t7`.`c76`) and (`test`.`t6`.`c62` = `test`.`t7`.`c76`) and (`test`.`t2`.`c24` = `test`.`t5`.`c52`) and (`test`.`t6`.`c65` = `test`.`t5`.`c52`) and (`test`.`t2`.`c23` = `test`.`t5`.`c54`) and (`test`.`t4`.`c42` = `test`.`t5`.`c54`) and (`test`.`t2`.`c22` = `test`.`t3`.`c32`) and (`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 16.505078 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; c11 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 6 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 NULL 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 10.00 Using where 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 5.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 8.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 5.56 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t4`.`c44` = `test`.`t7`.`c74`) and (`test`.`t7`.`c73` = `test`.`t3`.`c36`) and (`test`.`t6`.`c63` = `test`.`t3`.`c35`) and (`test`.`t5`.`c53` = `test`.`t3`.`c34`) and (`test`.`t7`.`c75` = `test`.`t3`.`c34`) and (`test`.`t4`.`c43` = `test`.`t3`.`c33`) and (`test`.`t6`.`c64` = `test`.`t3`.`c33`) and (`test`.`t2`.`c26` = `test`.`t7`.`c72`) and (`test`.`t2`.`c25` = `test`.`t7`.`c76`) and (`test`.`t6`.`c62` = `test`.`t7`.`c76`) and (`test`.`t2`.`c24` = `test`.`t5`.`c52`) and (`test`.`t6`.`c65` = `test`.`t5`.`c52`) and (`test`.`t2`.`c23` = `test`.`t5`.`c54`) and (`test`.`t4`.`c42` = `test`.`t5`.`c54`) and (`test`.`t2`.`c22` = `test`.`t3`.`c32`) and (`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 16.505078 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; c11 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 6 set optimizer_search_depth=62; select @@optimizer_search_depth; @@optimizer_search_depth 62 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 100.00 NULL 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 100.00 NULL 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t7`.`c71` = `test`.`t6`.`c62`) and (`test`.`t6`.`c61` = `test`.`t5`.`c52`) and (`test`.`t5`.`c51` = `test`.`t4`.`c42`) and (`test`.`t4`.`c41` = `test`.`t3`.`c32`) and (`test`.`t3`.`c31` = `test`.`t2`.`c22`) and (`test`.`t2`.`c21` = `test`.`t1`.`c12`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 39.215192 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 100.00 NULL 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 100.00 NULL 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t7`.`c71` = `test`.`t6`.`c62`) and (`test`.`t6`.`c61` = `test`.`t5`.`c52`) and (`test`.`t5`.`c51` = `test`.`t4`.`c42`) and (`test`.`t4`.`c41` = `test`.`t3`.`c32`) and (`test`.`t3`.`c31` = `test`.`t2`.`c22`) and (`test`.`t2`.`c21` = `test`.`t1`.`c12`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 39.215192 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 Using index 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 100.00 Using index 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 100.00 Using index 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 43.399979 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 16.67 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 100.00 Using index 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 100.00 Using index 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 100.00 Using index 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 10.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t2`.`c21` = `test`.`t1`.`c11`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 43.399979 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; c11 1 2 3 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 46 EXPLAIN select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 100.00 NULL 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 33.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 11.11 Using where 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 6.67 Using where 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 5.00 Using where 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 8.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 5.56 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t1` join `test`.`t2` join `test`.`t3` join `test`.`t4` join `test`.`t5` join `test`.`t6` join `test`.`t7` where ((`test`.`t4`.`c44` = `test`.`t7`.`c74`) and (`test`.`t7`.`c73` = `test`.`t3`.`c36`) and (`test`.`t6`.`c63` = `test`.`t3`.`c35`) and (`test`.`t5`.`c53` = `test`.`t3`.`c34`) and (`test`.`t7`.`c75` = `test`.`t3`.`c34`) and (`test`.`t4`.`c43` = `test`.`t3`.`c33`) and (`test`.`t6`.`c64` = `test`.`t3`.`c33`) and (`test`.`t7`.`c72` = `test`.`t2`.`c26`) and (`test`.`t7`.`c76` = `test`.`t2`.`c25`) and (`test`.`t6`.`c62` = `test`.`t2`.`c25`) and (`test`.`t5`.`c52` = `test`.`t2`.`c24`) and (`test`.`t6`.`c65` = `test`.`t2`.`c24`) and (`test`.`t5`.`c54` = `test`.`t2`.`c23`) and (`test`.`t4`.`c42` = `test`.`t2`.`c23`) and (`test`.`t3`.`c32` = `test`.`t2`.`c22`) and (`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t1`.`c11` = `test`.`t2`.`c21`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 15.512271 FLUSH STATUS; select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; c11 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 13 EXPLAIN select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 6 100.00 NULL 1 SIMPLE t1 NULL ALL PRIMARY NULL NULL NULL 3 33.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 11.11 Using where 1 SIMPLE t5 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 6.67 Using where 1 SIMPLE t7 NULL eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 5.00 Using where 1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 12 8.33 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t6 NULL ALL NULL NULL NULL NULL 18 5.56 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`c11` AS `c11` from `test`.`t7` join `test`.`t6` join `test`.`t5` join `test`.`t4` join `test`.`t3` join `test`.`t2` join `test`.`t1` where ((`test`.`t4`.`c44` = `test`.`t7`.`c74`) and (`test`.`t7`.`c73` = `test`.`t3`.`c36`) and (`test`.`t6`.`c63` = `test`.`t3`.`c35`) and (`test`.`t5`.`c53` = `test`.`t3`.`c34`) and (`test`.`t7`.`c75` = `test`.`t3`.`c34`) and (`test`.`t4`.`c43` = `test`.`t3`.`c33`) and (`test`.`t6`.`c64` = `test`.`t3`.`c33`) and (`test`.`t7`.`c72` = `test`.`t2`.`c26`) and (`test`.`t7`.`c76` = `test`.`t2`.`c25`) and (`test`.`t6`.`c62` = `test`.`t2`.`c25`) and (`test`.`t5`.`c52` = `test`.`t2`.`c24`) and (`test`.`t6`.`c65` = `test`.`t2`.`c24`) and (`test`.`t5`.`c54` = `test`.`t2`.`c23`) and (`test`.`t4`.`c42` = `test`.`t2`.`c23`) and (`test`.`t3`.`c32` = `test`.`t2`.`c22`) and (`test`.`t7`.`c71` = `test`.`t1`.`c16`) and (`test`.`t6`.`c61` = `test`.`t1`.`c15`) and (`test`.`t5`.`c51` = `test`.`t1`.`c14`) and (`test`.`t4`.`c41` = `test`.`t1`.`c13`) and (`test`.`t3`.`c31` = `test`.`t1`.`c12`) and (`test`.`t1`.`c11` = `test`.`t2`.`c21`)) SHOW STATUS LIKE 'Last_query_cost'; Variable_name Value Last_query_cost 15.512271 FLUSH STATUS; select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; c11 SELECT SUM(variable_value) AS Total_handler_reads FROM information_schema.session_status WHERE variable_name LIKE 'Handler_read%'; Total_handler_reads 13 drop table t1,t2,t3,t4,t5,t6,t7; CREATE TABLE t1 (a int, b int, d int, i int); INSERT INTO t1 VALUES (1,1,1,1); CREATE TABLE t2 (b int, c int, j int); INSERT INTO t2 VALUES (1,1,1); CREATE TABLE t2_1 (j int); INSERT INTO t2_1 VALUES (1); CREATE TABLE t3 (c int, f int); INSERT INTO t3 VALUES (1,1); CREATE TABLE t3_1 (f int); INSERT INTO t3_1 VALUES (1); CREATE TABLE t4 (d int, e int, k int); INSERT INTO t4 VALUES (1,1,1); CREATE TABLE t4_1 (k int); INSERT INTO t4_1 VALUES (1); CREATE TABLE t5 (g int, d int, h int, l int); INSERT INTO t5 VALUES (1,1,1,1); CREATE TABLE t5_1 (l int); INSERT INTO t5_1 VALUES (1); SET optimizer_search_depth = 3; SELECT 1 FROM t1 LEFT JOIN ( t2 JOIN t3 ON t3.c = t2.c ) ON t2.b = t1.b LEFT JOIN ( t4 JOIN t5 ON t5.d = t4.d ) ON t4.d = t1.d ; 1 1 SELECT 1 FROM t1 LEFT JOIN ( t2 LEFT JOIN (t3 JOIN t3_1 ON t3.f = t3_1.f) ON t3.c = t2.c ) ON t2.b = t1.b LEFT JOIN ( t4 JOIN t5 ON t5.d = t4.d ) ON t4.d = t1.d ; 1 1 SELECT 1 FROM t1 LEFT JOIN ( (t2 JOIN t2_1 ON t2.j = t2_1.j) JOIN t3 ON t3.c = t2.c ) ON t2.b = t1.b LEFT JOIN ( t4 JOIN t5 ON t5.d = t4.d ) ON t4.d = t1.d ; 1 1 SELECT 1 FROM t1 LEFT JOIN ( t2 JOIN t3 ON t3.c = t2.c ) ON t2.b = t1.b LEFT JOIN ( (t4 JOIN t4_1 ON t4.k = t4_1.k) LEFT JOIN t5 ON t5.d = t4.d ) ON t4.d = t1.d ; 1 1 SELECT 1 FROM t1 LEFT JOIN ( t2 JOIN t3 ON t3.c = t2.c ) ON t2.b = t1.b LEFT JOIN ( t4 LEFT JOIN (t5 JOIN t5_1 ON t5.l = t5_1.l) ON t5.d = t4.d ) ON t4.d = t1.d ; 1 1 SET optimizer_search_depth = DEFAULT; DROP TABLE t1,t2,t2_1,t3,t3_1,t4,t4_1,t5,t5_1; End of 5.0 tests # # Bug #59326: Greedy optimizer produce stupid query execution plans. # CREATE TABLE t10( K INT NOT NULL AUTO_INCREMENT, I INT, PRIMARY KEY(K) ); INSERT INTO t10(I) VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(0); CREATE TABLE t100 LIKE t10; INSERT INTO t100(I) SELECT X.I FROM t10 AS X,t10 AS Y; CREATE TABLE t10000 LIKE t10; INSERT INTO t10000(I) SELECT X.I FROM t100 AS X, t100 AS Y; EXPLAIN SELECT * FROM t10,t100,t10000; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 NULL 1 SIMPLE t100 NULL ALL NULL NULL NULL NULL 100 100.00 Using join buffer (Block Nested Loop) 1 SIMPLE t10000 NULL ALL NULL NULL NULL NULL 10000 100.00 Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t10`.`K` AS `K`,`test`.`t10`.`I` AS `I`,`test`.`t100`.`K` AS `K`,`test`.`t100`.`I` AS `I`,`test`.`t10000`.`K` AS `K`,`test`.`t10000`.`I` AS `I` from `test`.`t10` join `test`.`t100` join `test`.`t10000` EXPLAIN SELECT * FROM t10,t10000,t100; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 NULL 1 SIMPLE t100 NULL ALL NULL NULL NULL NULL 100 100.00 Using join buffer (Block Nested Loop) 1 SIMPLE t10000 NULL ALL NULL NULL NULL NULL 10000 100.00 Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t10`.`K` AS `K`,`test`.`t10`.`I` AS `I`,`test`.`t10000`.`K` AS `K`,`test`.`t10000`.`I` AS `I`,`test`.`t100`.`K` AS `K`,`test`.`t100`.`I` AS `I` from `test`.`t10` join `test`.`t10000` join `test`.`t100` EXPLAIN SELECT * FROM t100,t10,t10000; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 NULL 1 SIMPLE t100 NULL ALL NULL NULL NULL NULL 100 100.00 Using join buffer (Block Nested Loop) 1 SIMPLE t10000 NULL ALL NULL NULL NULL NULL 10000 100.00 Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t100`.`K` AS `K`,`test`.`t100`.`I` AS `I`,`test`.`t10`.`K` AS `K`,`test`.`t10`.`I` AS `I`,`test`.`t10000`.`K` AS `K`,`test`.`t10000`.`I` AS `I` from `test`.`t100` join `test`.`t10` join `test`.`t10000` EXPLAIN SELECT * FROM t100,t10000,t10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 NULL 1 SIMPLE t100 NULL ALL NULL NULL NULL NULL 100 100.00 Using join buffer (Block Nested Loop) 1 SIMPLE t10000 NULL ALL NULL NULL NULL NULL 10000 100.00 Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t100`.`K` AS `K`,`test`.`t100`.`I` AS `I`,`test`.`t10000`.`K` AS `K`,`test`.`t10000`.`I` AS `I`,`test`.`t10`.`K` AS `K`,`test`.`t10`.`I` AS `I` from `test`.`t100` join `test`.`t10000` join `test`.`t10` EXPLAIN SELECT * FROM t10000,t10,t100; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 NULL 1 SIMPLE t100 NULL ALL NULL NULL NULL NULL 100 100.00 Using join buffer (Block Nested Loop) 1 SIMPLE t10000 NULL ALL NULL NULL NULL NULL 10000 100.00 Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t10000`.`K` AS `K`,`test`.`t10000`.`I` AS `I`,`test`.`t10`.`K` AS `K`,`test`.`t10`.`I` AS `I`,`test`.`t100`.`K` AS `K`,`test`.`t100`.`I` AS `I` from `test`.`t10000` join `test`.`t10` join `test`.`t100` EXPLAIN SELECT * FROM t10000,t100,t10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 NULL 1 SIMPLE t100 NULL ALL NULL NULL NULL NULL 100 100.00 Using join buffer (Block Nested Loop) 1 SIMPLE t10000 NULL ALL NULL NULL NULL NULL 10000 100.00 Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t10000`.`K` AS `K`,`test`.`t10000`.`I` AS `I`,`test`.`t100`.`K` AS `K`,`test`.`t100`.`I` AS `I`,`test`.`t10`.`K` AS `K`,`test`.`t10`.`I` AS `I` from `test`.`t10000` join `test`.`t100` join `test`.`t10` flush status; EXPLAIN SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.K=t10.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t100` join `test`.`t10000` where ((`test`.`t100`.`K` = `test`.`t10`.`I`) and (`test`.`t10000`.`K` = `test`.`t10`.`I`)) SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.K=t10.I; COUNT(*) 9 flush status; EXPLAIN SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000,t100 WHERE t100.K=t10.I AND t10000.K=t10.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` join `test`.`t100` where ((`test`.`t10000`.`K` = `test`.`t10`.`I`) and (`test`.`t100`.`K` = `test`.`t10`.`I`)) SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000,t100 WHERE t100.K=t10.I AND t10000.K=t10.I; COUNT(*) 9 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.K=t10.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t100` join `test`.`t10000` where ((`test`.`t100`.`K` = `test`.`t10`.`I`) and (`test`.`t10000`.`K` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.K=t10.I; COUNT(*) 9 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000,t100 WHERE t100.K=t10.I AND t10000.K=t10.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` join `test`.`t100` where ((`test`.`t100`.`K` = `test`.`t10`.`I`) and (`test`.`t10000`.`K` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000,t100 WHERE t100.K=t10.I AND t10000.K=t10.I; COUNT(*) 9 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.K=t10.K; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL PRIMARY NULL NULL NULL 10 100.00 Using where 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.K 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t100` join `test`.`t10000` where ((`test`.`t10000`.`K` = `test`.`t10`.`K`) and (`test`.`t100`.`K` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.K=t10.K; COUNT(*) 9 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000,t100 WHERE t100.K=t10.I AND t10000.K=t10.K; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL PRIMARY NULL NULL NULL 10 100.00 Using where 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.K 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` join `test`.`t100` where ((`test`.`t10000`.`K` = `test`.`t10`.`K`) and (`test`.`t100`.`K` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000,t100 WHERE t100.K=t10.I AND t10000.K=t10.K; COUNT(*) 9 flush status; EXPLAIN SELECT COUNT(*) FROM t100,t10,t10000 WHERE t100.K=t10.I AND t10000.K=t10.K; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL PRIMARY NULL NULL NULL 10 100.00 Using where 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.K 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t100` join `test`.`t10` join `test`.`t10000` where ((`test`.`t10000`.`K` = `test`.`t10`.`K`) and (`test`.`t100`.`K` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t100,t10,t10000 WHERE t100.K=t10.I AND t10000.K=t10.K; COUNT(*) 9 flush status; EXPLAIN SELECT COUNT(*) FROM t100,t10000,t10 WHERE t100.K=t10.I AND t10000.K=t10.K; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL PRIMARY NULL NULL NULL 10 100.00 Using where 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.K 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t100` join `test`.`t10000` join `test`.`t10` where ((`test`.`t10000`.`K` = `test`.`t10`.`K`) and (`test`.`t100`.`K` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t100,t10000,t10 WHERE t100.K=t10.I AND t10000.K=t10.K; COUNT(*) 9 flush status; EXPLAIN SELECT COUNT(*) FROM t10000,t10,t100 WHERE t100.K=t10.I AND t10000.K=t10.K; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL PRIMARY NULL NULL NULL 10 100.00 Using where 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.K 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10000` join `test`.`t10` join `test`.`t100` where ((`test`.`t10000`.`K` = `test`.`t10`.`K`) and (`test`.`t100`.`K` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10000,t10,t100 WHERE t100.K=t10.I AND t10000.K=t10.K; COUNT(*) 9 flush status; EXPLAIN SELECT COUNT(*) FROM t10000,t100,t10 WHERE t100.K=t10.I AND t10000.K=t10.K; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL PRIMARY NULL NULL NULL 10 100.00 Using where 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.K 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10000` join `test`.`t100` join `test`.`t10` where ((`test`.`t10000`.`K` = `test`.`t10`.`K`) and (`test`.`t100`.`K` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10000,t100,t10 WHERE t100.K=t10.I AND t10000.K=t10.K; COUNT(*) 9 flush status; EXPLAIN SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.I=t10.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL ALL NULL NULL NULL NULL 10000 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t100` join `test`.`t10000` where ((`test`.`t100`.`K` = `test`.`t10`.`I`) and (`test`.`t10000`.`I` = `test`.`t10`.`I`)) SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.I=t10.I; COUNT(*) 9000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.I=t10.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL ALL NULL NULL NULL NULL 10000 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t100` join `test`.`t10000` where ((`test`.`t100`.`K` = `test`.`t10`.`I`) and (`test`.`t10000`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.I=t10.I; COUNT(*) 9000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000,t100 WHERE t100.K=t10.I AND t10000.I=t10.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL ALL NULL NULL NULL NULL 10000 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` join `test`.`t100` where ((`test`.`t100`.`K` = `test`.`t10`.`I`) and (`test`.`t10000`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000,t100 WHERE t100.K=t10.I AND t10000.I=t10.I; COUNT(*) 9000 flush status; EXPLAIN SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000,t100 WHERE t100.I=t10.I AND t10000.K=t10.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t100 NULL ALL NULL NULL NULL NULL 100 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` join `test`.`t100` where ((`test`.`t10000`.`K` = `test`.`t10`.`I`) and (`test`.`t100`.`I` = `test`.`t10`.`I`)) SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000,t100 WHERE t100.I=t10.I AND t10000.K=t10.I; COUNT(*) 90 # See BUG#18352936 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t100,t10000 WHERE t100.I=t10.I AND t10000.K=t10.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t100 NULL ALL NULL NULL NULL NULL 100 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t100` join `test`.`t10000` where ((`test`.`t10000`.`K` = `test`.`t10`.`I`) and (`test`.`t100`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t100,t10000 WHERE t100.I=t10.I AND t10000.K=t10.I; COUNT(*) 90 # See BUG#18352936 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000,t100 WHERE t100.I=t10.I AND t10000.K=t10.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t100 NULL ALL NULL NULL NULL NULL 100 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` join `test`.`t100` where ((`test`.`t10000`.`K` = `test`.`t10`.`I`) and (`test`.`t100`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000,t100 WHERE t100.I=t10.I AND t10000.K=t10.I; COUNT(*) 90 flush status; EXPLAIN SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000,t100 WHERE t100.I=t10.I AND t10000.K=t100.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t100 NULL ALL NULL NULL NULL NULL 100 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` join `test`.`t100` where ((`test`.`t10000`.`K` = `test`.`t10`.`I`) and (`test`.`t100`.`I` = `test`.`t10`.`I`)) SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000,t100 WHERE t100.I=t10.I AND t10000.K=t100.I; COUNT(*) 90 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t100,t10000 WHERE t100.I=t10.I AND t10000.K=t100.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t100 NULL ALL NULL NULL NULL NULL 100 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t100` join `test`.`t10000` where ((`test`.`t10000`.`K` = `test`.`t10`.`I`) and (`test`.`t100`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t100,t10000 WHERE t100.I=t10.I AND t10000.K=t100.I; COUNT(*) 90 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000,t100 WHERE t100.I=t10.I AND t10000.K=t100.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t10000 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t100 NULL ALL NULL NULL NULL NULL 100 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` join `test`.`t100` where ((`test`.`t10000`.`K` = `test`.`t10`.`I`) and (`test`.`t100`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000,t100 WHERE t100.I=t10.I AND t10000.K=t100.I; COUNT(*) 90 flush status; EXPLAIN SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL index NULL PRIMARY 4 NULL 10000 100.00 Using index; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `x` join `test`.`t10000` `y` where (`test`.`x`.`K` = `test`.`t10`.`I`) SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i; COUNT(*) 90000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL index NULL PRIMARY 4 NULL 10000 100.00 Using index; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `x` join `test`.`t10000` `y` where (`test`.`x`.`K` = `test`.`t10`.`I`) SELECT COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i; COUNT(*) 90000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000 y,t10000 x WHERE x.k=t10.i; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL index NULL PRIMARY 4 NULL 10000 100.00 Using index; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `y` join `test`.`t10000` `x` where (`test`.`x`.`K` = `test`.`t10`.`I`) SELECT COUNT(*) FROM t10,t10000 y,t10000 x WHERE x.k=t10.i; COUNT(*) 90000 flush status; EXPLAIN SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=t10.i; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL ALL NULL NULL NULL NULL 10000 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `x` join `test`.`t10000` `y` where ((`test`.`x`.`K` = `test`.`t10`.`I`) and (`test`.`y`.`I` = `test`.`t10`.`I`)) SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=t10.i; COUNT(*) 9000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=t10.i; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL ALL NULL NULL NULL NULL 10000 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `x` join `test`.`t10000` `y` where ((`test`.`x`.`K` = `test`.`t10`.`I`) and (`test`.`y`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=t10.i; COUNT(*) 9000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000 y,t10000 x WHERE x.k=t10.i AND y.i=t10.i; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL ALL NULL NULL NULL NULL 10000 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `y` join `test`.`t10000` `x` where ((`test`.`x`.`K` = `test`.`t10`.`I`) and (`test`.`y`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000 y,t10000 x WHERE x.k=t10.i AND y.i=t10.i; COUNT(*) 9000 flush status; EXPLAIN SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=x.k; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL ALL NULL NULL NULL NULL 10000 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `x` join `test`.`t10000` `y` where ((`test`.`x`.`K` = `test`.`t10`.`I`) and (`test`.`y`.`I` = `test`.`t10`.`I`)) SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=x.k; COUNT(*) 9000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=x.k; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL ALL NULL NULL NULL NULL 10000 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `x` join `test`.`t10000` `y` where ((`test`.`x`.`K` = `test`.`t10`.`I`) and (`test`.`y`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=x.k; COUNT(*) 9000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000 y,t10000 x WHERE x.k=t10.i AND y.i=x.k; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL ALL NULL NULL NULL NULL 10000 10.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `y` join `test`.`t10000` `x` where ((`test`.`x`.`K` = `test`.`t10`.`I`) and (`test`.`y`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000 y,t10000 x WHERE x.k=t10.i AND y.i=x.k; COUNT(*) 9000 CREATE INDEX IX ON t10(I); CREATE INDEX IX ON t100(I); CREATE INDEX IX ON t10000(I); flush status; EXPLAIN SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.I=t10.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL index IX IX 5 NULL 10 100.00 Using where; Using index 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL ref IX IX 5 test.t10.I 1000 100.00 Using index Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t100` join `test`.`t10000` where ((`test`.`t100`.`K` = `test`.`t10`.`I`) and (`test`.`t10000`.`I` = `test`.`t10`.`I`)) SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.I=t10.I; COUNT(*) 9000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.I=t10.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL index IX IX 5 NULL 10 100.00 Using where; Using index 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL ref IX IX 5 test.t10.I 1000 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t100` join `test`.`t10000` where ((`test`.`t100`.`K` = `test`.`t10`.`I`) and (`test`.`t10000`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t100,t10000 WHERE t100.K=t10.I AND t10000.I=t10.I; COUNT(*) 9000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000,t100 WHERE t100.K=t10.I AND t10000.I=t10.I; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL index IX IX 5 NULL 10 100.00 Using where; Using index 1 SIMPLE t100 NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE t10000 NULL ref IX IX 5 test.t10.I 1000 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` join `test`.`t100` where ((`test`.`t100`.`K` = `test`.`t10`.`I`) and (`test`.`t10000`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000,t100 WHERE t100.K=t10.I AND t10000.I=t10.I; COUNT(*) 9000 flush status; EXPLAIN SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL index IX IX 5 NULL 10 100.00 Using where; Using index 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL index NULL PRIMARY 4 NULL 10000 100.00 Using index; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `x` join `test`.`t10000` `y` where (`test`.`x`.`K` = `test`.`t10`.`I`) SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i; COUNT(*) 90000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL index IX IX 5 NULL 10 100.00 Using where; Using index 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL index NULL PRIMARY 4 NULL 10000 100.00 Using index; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `x` join `test`.`t10000` `y` where (`test`.`x`.`K` = `test`.`t10`.`I`) SELECT COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i; COUNT(*) 90000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000 y,t10000 x WHERE x.k=t10.i; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL index IX IX 5 NULL 10 100.00 Using where; Using index 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL index NULL PRIMARY 4 NULL 10000 100.00 Using index; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `y` join `test`.`t10000` `x` where (`test`.`x`.`K` = `test`.`t10`.`I`) SELECT COUNT(*) FROM t10,t10000 y,t10000 x WHERE x.k=t10.i; COUNT(*) 90000 flush status; EXPLAIN SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=t10.i; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL index IX IX 5 NULL 10 100.00 Using where; Using index 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL ref IX IX 5 test.t10.I 1000 100.00 Using index Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `x` join `test`.`t10000` `y` where ((`test`.`x`.`K` = `test`.`t10`.`I`) and (`test`.`y`.`I` = `test`.`t10`.`I`)) SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=t10.i; COUNT(*) 9000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=t10.i; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL index IX IX 5 NULL 10 100.00 Using where; Using index 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL ref IX IX 5 test.t10.I 1000 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `x` join `test`.`t10000` `y` where ((`test`.`x`.`K` = `test`.`t10`.`I`) and (`test`.`y`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=t10.i; COUNT(*) 9000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000 y,t10000 x WHERE x.k=t10.i AND y.i=t10.i; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL index IX IX 5 NULL 10 100.00 Using where; Using index 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL ref IX IX 5 test.t10.I 1000 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `y` join `test`.`t10000` `x` where ((`test`.`x`.`K` = `test`.`t10`.`I`) and (`test`.`y`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000 y,t10000 x WHERE x.k=t10.i AND y.i=t10.i; COUNT(*) 9000 flush status; EXPLAIN SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=x.k; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL index IX IX 5 NULL 10 100.00 Using where; Using index 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL ref IX IX 5 test.t10.I 1000 100.00 Using index Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `x` join `test`.`t10000` `y` where ((`test`.`x`.`K` = `test`.`t10`.`I`) and (`test`.`y`.`I` = `test`.`t10`.`I`)) SELECT STRAIGHT_JOIN COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=x.k; COUNT(*) 9000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=x.k; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL index IX IX 5 NULL 10 100.00 Using where; Using index 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL ref IX IX 5 test.t10.I 1000 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `x` join `test`.`t10000` `y` where ((`test`.`x`.`K` = `test`.`t10`.`I`) and (`test`.`y`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000 x,t10000 y WHERE x.k=t10.i AND y.i=x.k; COUNT(*) 9000 flush status; EXPLAIN SELECT COUNT(*) FROM t10,t10000 y,t10000 x WHERE x.k=t10.i AND y.i=x.k; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t10 NULL index IX IX 5 NULL 10 100.00 Using where; Using index 1 SIMPLE x NULL eq_ref PRIMARY PRIMARY 4 test.t10.I 1 100.00 Using index 1 SIMPLE y NULL ref IX IX 5 test.t10.I 1000 100.00 Using index Warnings: Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t10` join `test`.`t10000` `y` join `test`.`t10000` `x` where ((`test`.`x`.`K` = `test`.`t10`.`I`) and (`test`.`y`.`I` = `test`.`t10`.`I`)) SELECT COUNT(*) FROM t10,t10000 y,t10000 x WHERE x.k=t10.i AND y.i=x.k; COUNT(*) 9000 # # Test improved capabilities of analyzing complex query # plans without restricting 'optimizer_search_depth'. # Fix problems like those reported as bug#41740 & bug#58225. # # EPLAIN of queries using T1-T62 will timeout/hang wo/ fixes # DROP TABLE t10, t10000; CREATE TABLE t1 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t1(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 1; CREATE TABLE t2 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t2(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 2; CREATE TABLE t3 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t3(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 3; CREATE TABLE t4 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t4(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 4; CREATE TABLE t5 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t5(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 5; CREATE TABLE t6 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t6(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 6; CREATE TABLE t7 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t7(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 7; CREATE TABLE t8 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t8(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 8; CREATE TABLE t9 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t9(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 9; CREATE TABLE t10 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t10(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 10; CREATE TABLE t11 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t11(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 11; CREATE TABLE t12 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t12(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 12; CREATE TABLE t13 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t13(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 13; CREATE TABLE t14 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t14(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 14; CREATE TABLE t15 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t15(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 15; CREATE TABLE t16 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t16(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 16; CREATE TABLE t17 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t17(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 17; CREATE TABLE t18 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t18(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 18; CREATE TABLE t19 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t19(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 19; CREATE TABLE t20 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t20(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 20; CREATE TABLE t21 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t21(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 21; CREATE TABLE t22 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t22(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 22; CREATE TABLE t23 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t23(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 23; CREATE TABLE t24 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t24(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 24; CREATE TABLE t25 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t25(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 25; CREATE TABLE t26 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t26(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 26; CREATE TABLE t27 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t27(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 27; CREATE TABLE t28 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t28(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 28; CREATE TABLE t29 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t29(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 29; CREATE TABLE t30 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t30(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 30; CREATE TABLE t31 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t31(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 31; CREATE TABLE t32 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t32(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 32; CREATE TABLE t33 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t33(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 33; CREATE TABLE t34 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t34(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 34; CREATE TABLE t35 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t35(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 35; CREATE TABLE t36 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t36(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 36; CREATE TABLE t37 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t37(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 37; CREATE TABLE t38 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t38(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 38; CREATE TABLE t39 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t39(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 39; CREATE TABLE t40 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t40(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 40; CREATE TABLE t41 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t41(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 41; CREATE TABLE t42 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t42(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 42; CREATE TABLE t43 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t43(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 43; CREATE TABLE t44 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t44(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 44; CREATE TABLE t45 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t45(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 45; CREATE TABLE t46 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t46(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 46; CREATE TABLE t47 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t47(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 47; CREATE TABLE t48 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t48(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 48; CREATE TABLE t49 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t49(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 49; CREATE TABLE t50 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t50(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 50; CREATE TABLE t51 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t51(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 51; CREATE TABLE t52 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t52(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 52; CREATE TABLE t53 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t53(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 53; CREATE TABLE t54 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t54(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 54; CREATE TABLE t55 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t55(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 55; CREATE TABLE t56 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t56(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 56; CREATE TABLE t57 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t57(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 57; CREATE TABLE t58 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t58(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 58; CREATE TABLE t59 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t59(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 59; CREATE TABLE t60 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t60(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 60; CREATE TABLE t61 ( K INT NOT NULL AUTO_INCREMENT, I INT, A INT, PRIMARY KEY(K), KEY IX(A) ) engine = InnoDB; INSERT INTO t61(I,A) SELECT X.K,X.K FROM t100 AS X, t100 AS Y WHERE X.K < 20 AND Y.K <= 61; ANALYZE TABLE t100, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11, t12, t13, t14, t15, t16, t17, t18, t19, t20, t21, t22, t23, t24, t25, t26, t27, t28, t29, t30, t31, t32, t33, t34, t35, t36, t37, t38, t39, t40, t41, t42, t43, t44, t45, t46, t47, t48, t49, t50, t51, t52, t53, t54, t55, t56, t57, t58, t59, t60, t61; set optimizer_prune_level=1; set optimizer_search_depth=0; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I JOIN t58 ON t58.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I JOIN t58 ON t58.I=x.I JOIN t59 ON t59.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I JOIN t58 ON t58.I=x.I JOIN t59 ON t59.I=x.I JOIN t60 ON t60.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I JOIN t33 as t33 ON t33.I=x.I JOIN t33 as t34 ON t34.I=x.I JOIN t33 as t35 ON t35.I=x.I JOIN t33 as t36 ON t36.I=x.I JOIN t33 as t37 ON t37.I=x.I JOIN t33 as t38 ON t38.I=x.I JOIN t33 as t39 ON t39.I=x.I JOIN t33 as t40 ON t40.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I JOIN t33 as t33 ON t33.I=x.I JOIN t33 as t34 ON t34.I=x.I JOIN t33 as t35 ON t35.I=x.I JOIN t33 as t36 ON t36.I=x.I JOIN t33 as t37 ON t37.I=x.I JOIN t33 as t38 ON t38.I=x.I JOIN t33 as t39 ON t39.I=x.I JOIN t33 as t40 ON t40.I=x.I JOIN t41 as t41 ON t41.I=x.I JOIN t41 as t42 ON t42.I=x.I JOIN t41 as t43 ON t43.I=x.I JOIN t41 as t44 ON t44.I=x.I JOIN t41 as t45 ON t45.I=x.I JOIN t41 as t46 ON t46.I=x.I JOIN t41 as t47 ON t47.I=x.I JOIN t41 as t48 ON t48.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I JOIN t33 as t33 ON t33.I=x.I JOIN t33 as t34 ON t34.I=x.I JOIN t33 as t35 ON t35.I=x.I JOIN t33 as t36 ON t36.I=x.I JOIN t33 as t37 ON t37.I=x.I JOIN t33 as t38 ON t38.I=x.I JOIN t33 as t39 ON t39.I=x.I JOIN t33 as t40 ON t40.I=x.I JOIN t41 as t41 ON t41.I=x.I JOIN t41 as t42 ON t42.I=x.I JOIN t41 as t43 ON t43.I=x.I JOIN t41 as t44 ON t44.I=x.I JOIN t41 as t45 ON t45.I=x.I JOIN t41 as t46 ON t46.I=x.I JOIN t41 as t47 ON t47.I=x.I JOIN t41 as t48 ON t48.I=x.I JOIN t49 as t49 ON t49.I=x.I JOIN t49 as t50 ON t50.I=x.I JOIN t49 as t51 ON t51.I=x.I JOIN t49 as t52 ON t52.I=x.I JOIN t49 as t53 ON t53.I=x.I JOIN t49 as t54 ON t54.I=x.I JOIN t49 as t55 ON t55.I=x.I JOIN t49 as t56 ON t56.I=x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I JOIN t37 ON t37.I = x.I JOIN t38 ON t38.K = x.I JOIN t39 ON t39.I = x.I JOIN t40 ON t40.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I JOIN t37 ON t37.I = x.I JOIN t38 ON t38.K = x.I JOIN t39 ON t39.I = x.I JOIN t40 ON t40.I = x.I JOIN t41 ON t41.I = x.I JOIN t42 ON t42.K = x.I JOIN t43 ON t43.I = x.I JOIN t44 ON t44.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I JOIN t37 ON t37.I = x.I JOIN t38 ON t38.K = x.I JOIN t39 ON t39.I = x.I JOIN t40 ON t40.I = x.I JOIN t41 ON t41.I = x.I JOIN t42 ON t42.K = x.I JOIN t43 ON t43.I = x.I JOIN t44 ON t44.I = x.I JOIN t45 ON t45.I = x.I JOIN t46 ON t46.K = x.I JOIN t47 ON t47.I = x.I JOIN t48 ON t48.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I JOIN t37 ON t37.I = x.I JOIN t38 ON t38.K = x.I JOIN t39 ON t39.I = x.I JOIN t40 ON t40.I = x.I JOIN t41 ON t41.I = x.I JOIN t42 ON t42.K = x.I JOIN t43 ON t43.I = x.I JOIN t44 ON t44.I = x.I JOIN t45 ON t45.I = x.I JOIN t46 ON t46.K = x.I JOIN t47 ON t47.I = x.I JOIN t48 ON t48.I = x.I JOIN t49 ON t49.I = x.I JOIN t50 ON t50.K = x.I JOIN t51 ON t51.I = x.I JOIN t52 ON t52.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I JOIN t37 ON t37.I = x.I JOIN t38 ON t38.K = x.I JOIN t39 ON t39.I = x.I JOIN t40 ON t40.I = x.I JOIN t41 ON t41.I = x.I JOIN t42 ON t42.K = x.I JOIN t43 ON t43.I = x.I JOIN t44 ON t44.I = x.I JOIN t45 ON t45.I = x.I JOIN t46 ON t46.K = x.I JOIN t47 ON t47.I = x.I JOIN t48 ON t48.I = x.I JOIN t49 ON t49.I = x.I JOIN t50 ON t50.K = x.I JOIN t51 ON t51.I = x.I JOIN t52 ON t52.I = x.I JOIN t53 ON t53.I = x.I JOIN t54 ON t54.K = x.I JOIN t55 ON t55.I = x.I JOIN t56 ON t56.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I JOIN t37 ON t37.I = x.I JOIN t38 ON t38.K = x.I JOIN t39 ON t39.I = x.I JOIN t40 ON t40.I = x.I JOIN t41 ON t41.I = x.I JOIN t42 ON t42.K = x.I JOIN t43 ON t43.I = x.I JOIN t44 ON t44.I = x.I JOIN t45 ON t45.I = x.I JOIN t46 ON t46.K = x.I JOIN t47 ON t47.I = x.I JOIN t48 ON t48.I = x.I JOIN t49 ON t49.I = x.I JOIN t50 ON t50.K = x.I JOIN t51 ON t51.I = x.I JOIN t52 ON t52.I = x.I JOIN t53 ON t53.I = x.I JOIN t54 ON t54.K = x.I JOIN t55 ON t55.I = x.I JOIN t56 ON t56.I = x.I JOIN t57 ON t57.I = x.I JOIN t58 ON t58.K = x.I JOIN t59 ON t59.I = x.I JOIN t60 ON t60.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.K = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.K = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.K = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.K = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.K = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.K = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.K = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.K = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.K = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.K = x.I; 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EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.K=x.I JOIN t2 ON t2.K=x.I JOIN t3 ON t3.K=x.I JOIN t4 ON t4.K=x.I JOIN t5 ON t5.K=x.I JOIN t6 ON t6.K=x.I JOIN t7 ON t7.K=x.I JOIN t8 ON t8.K=x.I JOIN t9 ON t9.K=x.I JOIN t10 ON t10.K=x.I JOIN t11 ON t11.K=x.I JOIN t12 ON t12.K=x.I JOIN t13 ON t13.K=x.I JOIN t14 ON t14.K=x.I JOIN t15 ON t15.K=x.I JOIN t16 ON t16.K=x.I JOIN t17 ON t17.K=x.I JOIN t18 ON t18.K=x.I JOIN t19 ON t19.K=x.I JOIN t20 ON t20.K=x.I JOIN t21 ON t21.K=x.I JOIN t22 ON t22.K=x.I JOIN t23 ON t23.K=x.I JOIN t24 ON t24.K=x.I JOIN t25 ON t25.K=x.I JOIN t26 ON t26.K=x.I JOIN t27 ON t27.K=x.I JOIN t28 ON t28.K=x.I JOIN t29 ON t29.K=x.I JOIN t30 ON t30.K=x.I JOIN t31 ON t31.K=x.I JOIN t32 ON t32.K=x.I JOIN t33 ON t33.K=x.I JOIN t34 ON t34.K=x.I JOIN t35 ON t35.K=x.I JOIN t36 ON t36.K=x.I JOIN t37 ON t37.K=x.I JOIN t38 ON t38.K=x.I JOIN t39 ON t39.K=x.I JOIN t40 ON t40.K=x.I JOIN t41 ON t41.K=x.I JOIN t42 ON t42.K=x.I JOIN t43 ON t43.K=x.I JOIN t44 ON t44.K=x.I JOIN t45 ON t45.K=x.I JOIN t46 ON t46.K=x.I JOIN t47 ON t47.K=x.I JOIN t48 ON t48.K=x.I JOIN t49 ON t49.K=x.I JOIN t50 ON t50.K=x.I JOIN t51 ON t51.K=x.I JOIN t52 ON t52.K=x.I JOIN t53 ON t53.K=x.I JOIN t54 ON t54.K=x.I JOIN t55 ON t55.K=x.I JOIN t56 ON t56.K=x.I JOIN t57 ON t57.K=x.I JOIN t58 ON t58.K=x.I JOIN t59 ON t59.K=x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.K=x.I JOIN t2 ON t2.K=x.I JOIN t3 ON t3.K=x.I JOIN t4 ON t4.K=x.I JOIN t5 ON t5.K=x.I JOIN t6 ON t6.K=x.I JOIN t7 ON t7.K=x.I JOIN t8 ON t8.K=x.I JOIN t9 ON t9.K=x.I JOIN t10 ON t10.K=x.I JOIN t11 ON t11.K=x.I JOIN t12 ON t12.K=x.I JOIN t13 ON t13.K=x.I JOIN t14 ON t14.K=x.I JOIN t15 ON t15.K=x.I JOIN t16 ON t16.K=x.I JOIN t17 ON t17.K=x.I JOIN t18 ON t18.K=x.I JOIN t19 ON t19.K=x.I JOIN t20 ON t20.K=x.I JOIN t21 ON t21.K=x.I JOIN t22 ON t22.K=x.I JOIN t23 ON t23.K=x.I JOIN t24 ON t24.K=x.I JOIN t25 ON t25.K=x.I JOIN t26 ON t26.K=x.I JOIN t27 ON t27.K=x.I JOIN t28 ON t28.K=x.I JOIN t29 ON t29.K=x.I JOIN t30 ON t30.K=x.I JOIN t31 ON t31.K=x.I JOIN t32 ON t32.K=x.I JOIN t33 ON t33.K=x.I JOIN t34 ON t34.K=x.I JOIN t35 ON t35.K=x.I JOIN t36 ON t36.K=x.I JOIN t37 ON t37.K=x.I JOIN t38 ON t38.K=x.I JOIN t39 ON t39.K=x.I JOIN t40 ON t40.K=x.I JOIN t41 ON t41.K=x.I JOIN t42 ON t42.K=x.I JOIN t43 ON t43.K=x.I JOIN t44 ON t44.K=x.I JOIN t45 ON t45.K=x.I JOIN t46 ON t46.K=x.I JOIN t47 ON t47.K=x.I JOIN t48 ON t48.K=x.I JOIN t49 ON t49.K=x.I JOIN t50 ON t50.K=x.I JOIN t51 ON t51.K=x.I JOIN t52 ON t52.K=x.I JOIN t53 ON t53.K=x.I JOIN t54 ON t54.K=x.I JOIN t55 ON t55.K=x.I JOIN t56 ON t56.K=x.I JOIN t57 ON t57.K=x.I JOIN t58 ON t58.K=x.I JOIN t59 ON t59.K=x.I JOIN t60 ON t60.K=x.I; set optimizer_search_depth=1; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I JOIN t58 ON t58.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I JOIN t58 ON t58.I=x.I JOIN t59 ON t59.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I JOIN t58 ON t58.I=x.I JOIN t59 ON t59.I=x.I JOIN t60 ON t60.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I JOIN t33 as t33 ON t33.I=x.I JOIN t33 as t34 ON t34.I=x.I JOIN t33 as t35 ON t35.I=x.I JOIN t33 as t36 ON t36.I=x.I JOIN t33 as t37 ON t37.I=x.I JOIN t33 as t38 ON t38.I=x.I JOIN t33 as t39 ON t39.I=x.I JOIN t33 as t40 ON t40.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I JOIN t33 as t33 ON t33.I=x.I JOIN t33 as t34 ON t34.I=x.I JOIN t33 as t35 ON t35.I=x.I JOIN t33 as t36 ON t36.I=x.I JOIN t33 as t37 ON t37.I=x.I JOIN t33 as t38 ON t38.I=x.I JOIN t33 as t39 ON t39.I=x.I JOIN t33 as t40 ON t40.I=x.I JOIN t41 as t41 ON t41.I=x.I JOIN t41 as t42 ON t42.I=x.I JOIN t41 as t43 ON t43.I=x.I JOIN t41 as t44 ON t44.I=x.I JOIN t41 as t45 ON t45.I=x.I JOIN t41 as t46 ON t46.I=x.I JOIN t41 as t47 ON t47.I=x.I JOIN t41 as t48 ON t48.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I JOIN t33 as t33 ON t33.I=x.I JOIN t33 as t34 ON t34.I=x.I JOIN t33 as t35 ON t35.I=x.I JOIN t33 as t36 ON t36.I=x.I JOIN t33 as t37 ON t37.I=x.I JOIN t33 as t38 ON t38.I=x.I JOIN t33 as t39 ON t39.I=x.I JOIN t33 as t40 ON t40.I=x.I JOIN t41 as t41 ON t41.I=x.I JOIN t41 as t42 ON t42.I=x.I JOIN t41 as t43 ON t43.I=x.I JOIN t41 as t44 ON t44.I=x.I JOIN t41 as t45 ON t45.I=x.I JOIN t41 as t46 ON t46.I=x.I JOIN t41 as t47 ON t47.I=x.I JOIN t41 as t48 ON t48.I=x.I JOIN t49 as t49 ON t49.I=x.I JOIN t49 as t50 ON t50.I=x.I JOIN t49 as t51 ON t51.I=x.I JOIN t49 as t52 ON t52.I=x.I JOIN t49 as t53 ON t53.I=x.I JOIN t49 as t54 ON t54.I=x.I JOIN t49 as t55 ON t55.I=x.I JOIN t49 as t56 ON t56.I=x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I JOIN t37 ON t37.I = x.I JOIN t38 ON t38.K = x.I JOIN t39 ON t39.I = x.I JOIN t40 ON t40.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I JOIN t37 ON t37.I = x.I JOIN t38 ON t38.K = x.I JOIN t39 ON t39.I = x.I JOIN t40 ON t40.I = x.I JOIN t41 ON t41.I = x.I JOIN t42 ON t42.K = x.I JOIN t43 ON t43.I = x.I JOIN t44 ON t44.I = x.I; 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EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.K=x.I JOIN t2 ON t2.K=x.I JOIN t3 ON t3.K=x.I JOIN t4 ON t4.K=x.I JOIN t5 ON t5.K=x.I JOIN t6 ON t6.K=x.I JOIN t7 ON t7.K=x.I JOIN t8 ON t8.K=x.I JOIN t9 ON t9.K=x.I JOIN t10 ON t10.K=x.I JOIN t11 ON t11.K=x.I JOIN t12 ON t12.K=x.I JOIN t13 ON t13.K=x.I JOIN t14 ON t14.K=x.I JOIN t15 ON t15.K=x.I JOIN t16 ON t16.K=x.I JOIN t17 ON t17.K=x.I JOIN t18 ON t18.K=x.I JOIN t19 ON t19.K=x.I JOIN t20 ON t20.K=x.I JOIN t21 ON t21.K=x.I JOIN t22 ON t22.K=x.I JOIN t23 ON t23.K=x.I JOIN t24 ON t24.K=x.I JOIN t25 ON t25.K=x.I JOIN t26 ON t26.K=x.I JOIN t27 ON t27.K=x.I JOIN t28 ON t28.K=x.I JOIN t29 ON t29.K=x.I JOIN t30 ON t30.K=x.I JOIN t31 ON t31.K=x.I JOIN t32 ON t32.K=x.I JOIN t33 ON t33.K=x.I JOIN t34 ON t34.K=x.I JOIN t35 ON t35.K=x.I JOIN t36 ON t36.K=x.I JOIN t37 ON t37.K=x.I JOIN t38 ON t38.K=x.I JOIN t39 ON t39.K=x.I JOIN t40 ON t40.K=x.I JOIN t41 ON t41.K=x.I JOIN t42 ON t42.K=x.I JOIN t43 ON t43.K=x.I JOIN t44 ON t44.K=x.I JOIN t45 ON t45.K=x.I JOIN t46 ON t46.K=x.I JOIN t47 ON t47.K=x.I JOIN t48 ON t48.K=x.I JOIN t49 ON t49.K=x.I JOIN t50 ON t50.K=x.I JOIN t51 ON t51.K=x.I JOIN t52 ON t52.K=x.I JOIN t53 ON t53.K=x.I JOIN t54 ON t54.K=x.I JOIN t55 ON t55.K=x.I JOIN t56 ON t56.K=x.I JOIN t57 ON t57.K=x.I JOIN t58 ON t58.K=x.I JOIN t59 ON t59.K=x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.K=x.I JOIN t2 ON t2.K=x.I JOIN t3 ON t3.K=x.I JOIN t4 ON t4.K=x.I JOIN t5 ON t5.K=x.I JOIN t6 ON t6.K=x.I JOIN t7 ON t7.K=x.I JOIN t8 ON t8.K=x.I JOIN t9 ON t9.K=x.I JOIN t10 ON t10.K=x.I JOIN t11 ON t11.K=x.I JOIN t12 ON t12.K=x.I JOIN t13 ON t13.K=x.I JOIN t14 ON t14.K=x.I JOIN t15 ON t15.K=x.I JOIN t16 ON t16.K=x.I JOIN t17 ON t17.K=x.I JOIN t18 ON t18.K=x.I JOIN t19 ON t19.K=x.I JOIN t20 ON t20.K=x.I JOIN t21 ON t21.K=x.I JOIN t22 ON t22.K=x.I JOIN t23 ON t23.K=x.I JOIN t24 ON t24.K=x.I JOIN t25 ON t25.K=x.I JOIN t26 ON t26.K=x.I JOIN t27 ON t27.K=x.I JOIN t28 ON t28.K=x.I JOIN t29 ON t29.K=x.I JOIN t30 ON t30.K=x.I JOIN t31 ON t31.K=x.I JOIN t32 ON t32.K=x.I JOIN t33 ON t33.K=x.I JOIN t34 ON t34.K=x.I JOIN t35 ON t35.K=x.I JOIN t36 ON t36.K=x.I JOIN t37 ON t37.K=x.I JOIN t38 ON t38.K=x.I JOIN t39 ON t39.K=x.I JOIN t40 ON t40.K=x.I JOIN t41 ON t41.K=x.I JOIN t42 ON t42.K=x.I JOIN t43 ON t43.K=x.I JOIN t44 ON t44.K=x.I JOIN t45 ON t45.K=x.I JOIN t46 ON t46.K=x.I JOIN t47 ON t47.K=x.I JOIN t48 ON t48.K=x.I JOIN t49 ON t49.K=x.I JOIN t50 ON t50.K=x.I JOIN t51 ON t51.K=x.I JOIN t52 ON t52.K=x.I JOIN t53 ON t53.K=x.I JOIN t54 ON t54.K=x.I JOIN t55 ON t55.K=x.I JOIN t56 ON t56.K=x.I JOIN t57 ON t57.K=x.I JOIN t58 ON t58.K=x.I JOIN t59 ON t59.K=x.I JOIN t60 ON t60.K=x.I; set optimizer_search_depth=3; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I JOIN t58 ON t58.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I JOIN t58 ON t58.I=x.I JOIN t59 ON t59.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I JOIN t58 ON t58.I=x.I JOIN t59 ON t59.I=x.I JOIN t60 ON t60.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I JOIN t33 as t33 ON t33.I=x.I JOIN t33 as t34 ON t34.I=x.I JOIN t33 as t35 ON t35.I=x.I JOIN t33 as t36 ON t36.I=x.I JOIN t33 as t37 ON t37.I=x.I JOIN t33 as t38 ON t38.I=x.I JOIN t33 as t39 ON t39.I=x.I JOIN t33 as t40 ON t40.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I JOIN t33 as t33 ON t33.I=x.I JOIN t33 as t34 ON t34.I=x.I JOIN t33 as t35 ON t35.I=x.I JOIN t33 as t36 ON t36.I=x.I JOIN t33 as t37 ON t37.I=x.I JOIN t33 as t38 ON t38.I=x.I JOIN t33 as t39 ON t39.I=x.I JOIN t33 as t40 ON t40.I=x.I JOIN t41 as t41 ON t41.I=x.I JOIN t41 as t42 ON t42.I=x.I JOIN t41 as t43 ON t43.I=x.I JOIN t41 as t44 ON t44.I=x.I JOIN t41 as t45 ON t45.I=x.I JOIN t41 as t46 ON t46.I=x.I JOIN t41 as t47 ON t47.I=x.I JOIN t41 as t48 ON t48.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I JOIN t33 as t33 ON t33.I=x.I JOIN t33 as t34 ON t34.I=x.I JOIN t33 as t35 ON t35.I=x.I JOIN t33 as t36 ON t36.I=x.I JOIN t33 as t37 ON t37.I=x.I JOIN t33 as t38 ON t38.I=x.I JOIN t33 as t39 ON t39.I=x.I JOIN t33 as t40 ON t40.I=x.I JOIN t41 as t41 ON t41.I=x.I JOIN t41 as t42 ON t42.I=x.I JOIN t41 as t43 ON t43.I=x.I JOIN t41 as t44 ON t44.I=x.I JOIN t41 as t45 ON t45.I=x.I JOIN t41 as t46 ON t46.I=x.I JOIN t41 as t47 ON t47.I=x.I JOIN t41 as t48 ON t48.I=x.I JOIN t49 as t49 ON t49.I=x.I JOIN t49 as t50 ON t50.I=x.I JOIN t49 as t51 ON t51.I=x.I JOIN t49 as t52 ON t52.I=x.I JOIN t49 as t53 ON t53.I=x.I JOIN t49 as t54 ON t54.I=x.I JOIN t49 as t55 ON t55.I=x.I JOIN t49 as t56 ON t56.I=x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I JOIN t37 ON t37.I = x.I JOIN t38 ON t38.K = x.I JOIN t39 ON t39.I = x.I JOIN t40 ON t40.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I JOIN t37 ON t37.I = x.I JOIN t38 ON t38.K = x.I JOIN t39 ON t39.I = x.I JOIN t40 ON t40.I = x.I JOIN t41 ON t41.I = x.I JOIN t42 ON t42.K = x.I JOIN t43 ON t43.I = x.I JOIN t44 ON t44.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I JOIN t37 ON t37.I = x.I JOIN t38 ON t38.K = x.I JOIN t39 ON t39.I = x.I JOIN t40 ON t40.I = x.I JOIN t41 ON t41.I = x.I JOIN t42 ON t42.K = x.I JOIN t43 ON t43.I = x.I JOIN t44 ON t44.I = x.I JOIN t45 ON t45.I = x.I JOIN t46 ON t46.K = x.I JOIN t47 ON t47.I = x.I JOIN t48 ON t48.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I JOIN t33 ON t33.I = x.I JOIN t34 ON t34.K = x.I JOIN t35 ON t35.I = x.I JOIN t36 ON t36.I = x.I JOIN t37 ON t37.I = x.I JOIN t38 ON t38.K = x.I JOIN t39 ON t39.I = x.I JOIN t40 ON t40.I = x.I JOIN t41 ON t41.I = x.I JOIN t42 ON t42.K = x.I JOIN t43 ON t43.I = x.I JOIN t44 ON t44.I = x.I JOIN t45 ON t45.I = x.I JOIN t46 ON t46.K = x.I JOIN t47 ON t47.I = x.I JOIN t48 ON t48.I = x.I JOIN t49 ON t49.I = x.I JOIN t50 ON t50.K = x.I JOIN t51 ON t51.I = x.I JOIN t52 ON t52.I = x.I; 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EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.K=x.I JOIN t2 ON t2.K=x.I JOIN t3 ON t3.K=x.I JOIN t4 ON t4.K=x.I JOIN t5 ON t5.K=x.I JOIN t6 ON t6.K=x.I JOIN t7 ON t7.K=x.I JOIN t8 ON t8.K=x.I JOIN t9 ON t9.K=x.I JOIN t10 ON t10.K=x.I JOIN t11 ON t11.K=x.I JOIN t12 ON t12.K=x.I JOIN t13 ON t13.K=x.I JOIN t14 ON t14.K=x.I JOIN t15 ON t15.K=x.I JOIN t16 ON t16.K=x.I JOIN t17 ON t17.K=x.I JOIN t18 ON t18.K=x.I JOIN t19 ON t19.K=x.I JOIN t20 ON t20.K=x.I JOIN t21 ON t21.K=x.I JOIN t22 ON t22.K=x.I JOIN t23 ON t23.K=x.I JOIN t24 ON t24.K=x.I JOIN t25 ON t25.K=x.I JOIN t26 ON t26.K=x.I JOIN t27 ON t27.K=x.I JOIN t28 ON t28.K=x.I JOIN t29 ON t29.K=x.I JOIN t30 ON t30.K=x.I JOIN t31 ON t31.K=x.I JOIN t32 ON t32.K=x.I JOIN t33 ON t33.K=x.I JOIN t34 ON t34.K=x.I JOIN t35 ON t35.K=x.I JOIN t36 ON t36.K=x.I JOIN t37 ON t37.K=x.I JOIN t38 ON t38.K=x.I JOIN t39 ON t39.K=x.I JOIN t40 ON t40.K=x.I JOIN t41 ON t41.K=x.I JOIN t42 ON t42.K=x.I JOIN t43 ON t43.K=x.I JOIN t44 ON t44.K=x.I JOIN t45 ON t45.K=x.I JOIN t46 ON t46.K=x.I JOIN t47 ON t47.K=x.I JOIN t48 ON t48.K=x.I JOIN t49 ON t49.K=x.I JOIN t50 ON t50.K=x.I JOIN t51 ON t51.K=x.I JOIN t52 ON t52.K=x.I JOIN t53 ON t53.K=x.I JOIN t54 ON t54.K=x.I JOIN t55 ON t55.K=x.I JOIN t56 ON t56.K=x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.K=x.I JOIN t2 ON t2.K=x.I JOIN t3 ON t3.K=x.I JOIN t4 ON t4.K=x.I JOIN t5 ON t5.K=x.I JOIN t6 ON t6.K=x.I JOIN t7 ON t7.K=x.I JOIN t8 ON t8.K=x.I JOIN t9 ON t9.K=x.I JOIN t10 ON t10.K=x.I JOIN t11 ON t11.K=x.I JOIN t12 ON t12.K=x.I JOIN t13 ON t13.K=x.I JOIN t14 ON t14.K=x.I JOIN t15 ON t15.K=x.I JOIN t16 ON t16.K=x.I JOIN t17 ON t17.K=x.I JOIN t18 ON t18.K=x.I JOIN t19 ON t19.K=x.I JOIN t20 ON t20.K=x.I JOIN t21 ON t21.K=x.I JOIN t22 ON t22.K=x.I JOIN t23 ON t23.K=x.I JOIN t24 ON t24.K=x.I JOIN t25 ON t25.K=x.I JOIN t26 ON t26.K=x.I JOIN t27 ON t27.K=x.I JOIN t28 ON t28.K=x.I JOIN t29 ON t29.K=x.I JOIN t30 ON t30.K=x.I JOIN t31 ON t31.K=x.I JOIN t32 ON t32.K=x.I JOIN t33 ON t33.K=x.I JOIN t34 ON t34.K=x.I JOIN t35 ON t35.K=x.I JOIN t36 ON t36.K=x.I JOIN t37 ON t37.K=x.I JOIN t38 ON t38.K=x.I JOIN t39 ON t39.K=x.I JOIN t40 ON t40.K=x.I JOIN t41 ON t41.K=x.I JOIN t42 ON t42.K=x.I JOIN t43 ON t43.K=x.I JOIN t44 ON t44.K=x.I JOIN t45 ON t45.K=x.I JOIN t46 ON t46.K=x.I JOIN t47 ON t47.K=x.I JOIN t48 ON t48.K=x.I JOIN t49 ON t49.K=x.I JOIN t50 ON t50.K=x.I JOIN t51 ON t51.K=x.I JOIN t52 ON t52.K=x.I JOIN t53 ON t53.K=x.I JOIN t54 ON t54.K=x.I JOIN t55 ON t55.K=x.I JOIN t56 ON t56.K=x.I JOIN t57 ON t57.K=x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.K=x.I JOIN t2 ON t2.K=x.I JOIN t3 ON t3.K=x.I JOIN t4 ON t4.K=x.I JOIN t5 ON t5.K=x.I JOIN t6 ON t6.K=x.I JOIN t7 ON t7.K=x.I JOIN t8 ON t8.K=x.I JOIN t9 ON t9.K=x.I JOIN t10 ON t10.K=x.I JOIN t11 ON t11.K=x.I JOIN t12 ON t12.K=x.I JOIN t13 ON t13.K=x.I JOIN t14 ON t14.K=x.I JOIN t15 ON t15.K=x.I JOIN t16 ON t16.K=x.I JOIN t17 ON t17.K=x.I JOIN t18 ON t18.K=x.I JOIN t19 ON t19.K=x.I JOIN t20 ON t20.K=x.I JOIN t21 ON t21.K=x.I JOIN t22 ON t22.K=x.I JOIN t23 ON t23.K=x.I JOIN t24 ON t24.K=x.I JOIN t25 ON t25.K=x.I JOIN t26 ON t26.K=x.I JOIN t27 ON t27.K=x.I JOIN t28 ON t28.K=x.I JOIN t29 ON t29.K=x.I JOIN t30 ON t30.K=x.I JOIN t31 ON t31.K=x.I JOIN t32 ON t32.K=x.I JOIN t33 ON t33.K=x.I JOIN t34 ON t34.K=x.I JOIN t35 ON t35.K=x.I JOIN t36 ON t36.K=x.I JOIN t37 ON t37.K=x.I JOIN t38 ON t38.K=x.I JOIN t39 ON t39.K=x.I JOIN t40 ON t40.K=x.I JOIN t41 ON t41.K=x.I JOIN t42 ON t42.K=x.I JOIN t43 ON t43.K=x.I JOIN t44 ON t44.K=x.I JOIN t45 ON t45.K=x.I JOIN t46 ON t46.K=x.I JOIN t47 ON t47.K=x.I JOIN t48 ON t48.K=x.I JOIN t49 ON t49.K=x.I JOIN t50 ON t50.K=x.I JOIN t51 ON t51.K=x.I JOIN t52 ON t52.K=x.I JOIN t53 ON t53.K=x.I JOIN t54 ON t54.K=x.I JOIN t55 ON t55.K=x.I JOIN t56 ON t56.K=x.I JOIN t57 ON t57.K=x.I JOIN t58 ON t58.K=x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.K=x.I JOIN t2 ON t2.K=x.I JOIN t3 ON t3.K=x.I JOIN t4 ON t4.K=x.I JOIN t5 ON t5.K=x.I JOIN t6 ON t6.K=x.I JOIN t7 ON t7.K=x.I JOIN t8 ON t8.K=x.I JOIN t9 ON t9.K=x.I JOIN t10 ON t10.K=x.I JOIN t11 ON t11.K=x.I JOIN t12 ON t12.K=x.I JOIN t13 ON t13.K=x.I JOIN t14 ON t14.K=x.I JOIN t15 ON t15.K=x.I JOIN t16 ON t16.K=x.I JOIN t17 ON t17.K=x.I JOIN t18 ON t18.K=x.I JOIN t19 ON t19.K=x.I JOIN t20 ON t20.K=x.I JOIN t21 ON t21.K=x.I JOIN t22 ON t22.K=x.I JOIN t23 ON t23.K=x.I JOIN t24 ON t24.K=x.I JOIN t25 ON t25.K=x.I JOIN t26 ON t26.K=x.I JOIN t27 ON t27.K=x.I JOIN t28 ON t28.K=x.I JOIN t29 ON t29.K=x.I JOIN t30 ON t30.K=x.I JOIN t31 ON t31.K=x.I JOIN t32 ON t32.K=x.I JOIN t33 ON t33.K=x.I JOIN t34 ON t34.K=x.I JOIN t35 ON t35.K=x.I JOIN t36 ON t36.K=x.I JOIN t37 ON t37.K=x.I JOIN t38 ON t38.K=x.I JOIN t39 ON t39.K=x.I JOIN t40 ON t40.K=x.I JOIN t41 ON t41.K=x.I JOIN t42 ON t42.K=x.I JOIN t43 ON t43.K=x.I JOIN t44 ON t44.K=x.I JOIN t45 ON t45.K=x.I JOIN t46 ON t46.K=x.I JOIN t47 ON t47.K=x.I JOIN t48 ON t48.K=x.I JOIN t49 ON t49.K=x.I JOIN t50 ON t50.K=x.I JOIN t51 ON t51.K=x.I JOIN t52 ON t52.K=x.I JOIN t53 ON t53.K=x.I JOIN t54 ON t54.K=x.I JOIN t55 ON t55.K=x.I JOIN t56 ON t56.K=x.I JOIN t57 ON t57.K=x.I JOIN t58 ON t58.K=x.I JOIN t59 ON t59.K=x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.K=x.I JOIN t2 ON t2.K=x.I JOIN t3 ON t3.K=x.I JOIN t4 ON t4.K=x.I JOIN t5 ON t5.K=x.I JOIN t6 ON t6.K=x.I JOIN t7 ON t7.K=x.I JOIN t8 ON t8.K=x.I JOIN t9 ON t9.K=x.I JOIN t10 ON t10.K=x.I JOIN t11 ON t11.K=x.I JOIN t12 ON t12.K=x.I JOIN t13 ON t13.K=x.I JOIN t14 ON t14.K=x.I JOIN t15 ON t15.K=x.I JOIN t16 ON t16.K=x.I JOIN t17 ON t17.K=x.I JOIN t18 ON t18.K=x.I JOIN t19 ON t19.K=x.I JOIN t20 ON t20.K=x.I JOIN t21 ON t21.K=x.I JOIN t22 ON t22.K=x.I JOIN t23 ON t23.K=x.I JOIN t24 ON t24.K=x.I JOIN t25 ON t25.K=x.I JOIN t26 ON t26.K=x.I JOIN t27 ON t27.K=x.I JOIN t28 ON t28.K=x.I JOIN t29 ON t29.K=x.I JOIN t30 ON t30.K=x.I JOIN t31 ON t31.K=x.I JOIN t32 ON t32.K=x.I JOIN t33 ON t33.K=x.I JOIN t34 ON t34.K=x.I JOIN t35 ON t35.K=x.I JOIN t36 ON t36.K=x.I JOIN t37 ON t37.K=x.I JOIN t38 ON t38.K=x.I JOIN t39 ON t39.K=x.I JOIN t40 ON t40.K=x.I JOIN t41 ON t41.K=x.I JOIN t42 ON t42.K=x.I JOIN t43 ON t43.K=x.I JOIN t44 ON t44.K=x.I JOIN t45 ON t45.K=x.I JOIN t46 ON t46.K=x.I JOIN t47 ON t47.K=x.I JOIN t48 ON t48.K=x.I JOIN t49 ON t49.K=x.I JOIN t50 ON t50.K=x.I JOIN t51 ON t51.K=x.I JOIN t52 ON t52.K=x.I JOIN t53 ON t53.K=x.I JOIN t54 ON t54.K=x.I JOIN t55 ON t55.K=x.I JOIN t56 ON t56.K=x.I JOIN t57 ON t57.K=x.I JOIN t58 ON t58.K=x.I JOIN t59 ON t59.K=x.I JOIN t60 ON t60.K=x.I; set optimizer_search_depth=62; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I JOIN t58 ON t58.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I JOIN t58 ON t58.I=x.I JOIN t59 ON t59.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I=x.I JOIN t2 ON t2.I=x.I JOIN t3 ON t3.I=x.I JOIN t4 ON t4.I=x.I JOIN t5 ON t5.I=x.I JOIN t6 ON t6.I=x.I JOIN t7 ON t7.I=x.I JOIN t8 ON t8.I=x.I JOIN t9 ON t9.I=x.I JOIN t10 ON t10.I=x.I JOIN t11 ON t11.I=x.I JOIN t12 ON t12.I=x.I JOIN t13 ON t13.I=x.I JOIN t14 ON t14.I=x.I JOIN t15 ON t15.I=x.I JOIN t16 ON t16.I=x.I JOIN t17 ON t17.I=x.I JOIN t18 ON t18.I=x.I JOIN t19 ON t19.I=x.I JOIN t20 ON t20.I=x.I JOIN t21 ON t21.I=x.I JOIN t22 ON t22.I=x.I JOIN t23 ON t23.I=x.I JOIN t24 ON t24.I=x.I JOIN t25 ON t25.I=x.I JOIN t26 ON t26.I=x.I JOIN t27 ON t27.I=x.I JOIN t28 ON t28.I=x.I JOIN t29 ON t29.I=x.I JOIN t30 ON t30.I=x.I JOIN t31 ON t31.I=x.I JOIN t32 ON t32.I=x.I JOIN t33 ON t33.I=x.I JOIN t34 ON t34.I=x.I JOIN t35 ON t35.I=x.I JOIN t36 ON t36.I=x.I JOIN t37 ON t37.I=x.I JOIN t38 ON t38.I=x.I JOIN t39 ON t39.I=x.I JOIN t40 ON t40.I=x.I JOIN t41 ON t41.I=x.I JOIN t42 ON t42.I=x.I JOIN t43 ON t43.I=x.I JOIN t44 ON t44.I=x.I JOIN t45 ON t45.I=x.I JOIN t46 ON t46.I=x.I JOIN t47 ON t47.I=x.I JOIN t48 ON t48.I=x.I JOIN t49 ON t49.I=x.I JOIN t50 ON t50.I=x.I JOIN t51 ON t51.I=x.I JOIN t52 ON t52.I=x.I JOIN t53 ON t53.I=x.I JOIN t54 ON t54.I=x.I JOIN t55 ON t55.I=x.I JOIN t56 ON t56.I=x.I JOIN t57 ON t57.I=x.I JOIN t58 ON t58.I=x.I JOIN t59 ON t59.I=x.I JOIN t60 ON t60.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I JOIN t33 as t33 ON t33.I=x.I JOIN t33 as t34 ON t34.I=x.I JOIN t33 as t35 ON t35.I=x.I JOIN t33 as t36 ON t36.I=x.I JOIN t33 as t37 ON t37.I=x.I JOIN t33 as t38 ON t38.I=x.I JOIN t33 as t39 ON t39.I=x.I JOIN t33 as t40 ON t40.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I JOIN t33 as t33 ON t33.I=x.I JOIN t33 as t34 ON t34.I=x.I JOIN t33 as t35 ON t35.I=x.I JOIN t33 as t36 ON t36.I=x.I JOIN t33 as t37 ON t37.I=x.I JOIN t33 as t38 ON t38.I=x.I JOIN t33 as t39 ON t39.I=x.I JOIN t33 as t40 ON t40.I=x.I JOIN t41 as t41 ON t41.I=x.I JOIN t41 as t42 ON t42.I=x.I JOIN t41 as t43 ON t43.I=x.I JOIN t41 as t44 ON t44.I=x.I JOIN t41 as t45 ON t45.I=x.I JOIN t41 as t46 ON t46.I=x.I JOIN t41 as t47 ON t47.I=x.I JOIN t41 as t48 ON t48.I=x.I; select @@optimizer_prune_level; select @@optimizer_search_depth; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 as t1 ON t1.I=x.I JOIN t1 as t2 ON t2.I=x.I JOIN t1 as t3 ON t3.I=x.I JOIN t1 as t4 ON t4.I=x.I JOIN t1 as t5 ON t5.I=x.I JOIN t1 as t6 ON t6.I=x.I JOIN t1 as t7 ON t7.I=x.I JOIN t1 as t8 ON t8.I=x.I JOIN t9 as t9 ON t9.I=x.I JOIN t9 as t10 ON t10.I=x.I JOIN t9 as t11 ON t11.I=x.I JOIN t9 as t12 ON t12.I=x.I JOIN t9 as t13 ON t13.I=x.I JOIN t9 as t14 ON t14.I=x.I JOIN t9 as t15 ON t15.I=x.I JOIN t9 as t16 ON t16.I=x.I JOIN t17 as t17 ON t17.I=x.I JOIN t17 as t18 ON t18.I=x.I JOIN t17 as t19 ON t19.I=x.I JOIN t17 as t20 ON t20.I=x.I JOIN t17 as t21 ON t21.I=x.I JOIN t17 as t22 ON t22.I=x.I JOIN t17 as t23 ON t23.I=x.I JOIN t17 as t24 ON t24.I=x.I JOIN t25 as t25 ON t25.I=x.I JOIN t25 as t26 ON t26.I=x.I JOIN t25 as t27 ON t27.I=x.I JOIN t25 as t28 ON t28.I=x.I JOIN t25 as t29 ON t29.I=x.I JOIN t25 as t30 ON t30.I=x.I JOIN t25 as t31 ON t31.I=x.I JOIN t25 as t32 ON t32.I=x.I JOIN t33 as t33 ON t33.I=x.I JOIN t33 as t34 ON t34.I=x.I JOIN t33 as t35 ON t35.I=x.I JOIN t33 as t36 ON t36.I=x.I JOIN t33 as t37 ON t37.I=x.I JOIN t33 as t38 ON t38.I=x.I JOIN t33 as t39 ON t39.I=x.I JOIN t33 as t40 ON t40.I=x.I JOIN t41 as t41 ON t41.I=x.I JOIN t41 as t42 ON t42.I=x.I JOIN t41 as t43 ON t43.I=x.I JOIN t41 as t44 ON t44.I=x.I JOIN t41 as t45 ON t45.I=x.I JOIN t41 as t46 ON t46.I=x.I JOIN t41 as t47 ON t47.I=x.I JOIN t41 as t48 ON t48.I=x.I JOIN t49 as t49 ON t49.I=x.I JOIN t49 as t50 ON t50.I=x.I JOIN t49 as t51 ON t51.I=x.I JOIN t49 as t52 ON t52.I=x.I JOIN t49 as t53 ON t53.I=x.I JOIN t49 as t54 ON t54.I=x.I JOIN t49 as t55 ON t55.I=x.I JOIN t49 as t56 ON t56.I=x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.I = x.I JOIN t2 ON t2.K = x.I JOIN t3 ON t3.I = x.I JOIN t4 ON t4.I = x.I JOIN t5 ON t5.I = x.I JOIN t6 ON t6.K = x.I JOIN t7 ON t7.I = x.I JOIN t8 ON t8.I = x.I JOIN t9 ON t9.I = x.I JOIN t10 ON t10.K = x.I JOIN t11 ON t11.I = x.I JOIN t12 ON t12.I = x.I JOIN t13 ON t13.I = x.I JOIN t14 ON t14.K = x.I JOIN t15 ON t15.I = x.I JOIN t16 ON t16.I = x.I JOIN t17 ON t17.I = x.I JOIN t18 ON t18.K = x.I JOIN t19 ON t19.I = x.I JOIN t20 ON t20.I = x.I JOIN t21 ON t21.I = x.I JOIN t22 ON t22.K = x.I JOIN t23 ON t23.I = x.I JOIN t24 ON t24.I = x.I JOIN t25 ON t25.I = x.I JOIN t26 ON t26.K = x.I JOIN t27 ON t27.I = x.I JOIN t28 ON t28.I = x.I JOIN t29 ON t29.I = x.I JOIN t30 ON t30.K = x.I JOIN t31 ON t31.I = x.I JOIN t32 ON t32.I = x.I; 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EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.K=x.I JOIN t2 ON t2.K=x.I JOIN t3 ON t3.K=x.I JOIN t4 ON t4.K=x.I JOIN t5 ON t5.K=x.I JOIN t6 ON t6.K=x.I JOIN t7 ON t7.K=x.I JOIN t8 ON t8.K=x.I JOIN t9 ON t9.K=x.I JOIN t10 ON t10.K=x.I JOIN t11 ON t11.K=x.I JOIN t12 ON t12.K=x.I JOIN t13 ON t13.K=x.I JOIN t14 ON t14.K=x.I JOIN t15 ON t15.K=x.I JOIN t16 ON t16.K=x.I JOIN t17 ON t17.K=x.I JOIN t18 ON t18.K=x.I JOIN t19 ON t19.K=x.I JOIN t20 ON t20.K=x.I JOIN t21 ON t21.K=x.I JOIN t22 ON t22.K=x.I JOIN t23 ON t23.K=x.I JOIN t24 ON t24.K=x.I JOIN t25 ON t25.K=x.I JOIN t26 ON t26.K=x.I JOIN t27 ON t27.K=x.I JOIN t28 ON t28.K=x.I JOIN t29 ON t29.K=x.I JOIN t30 ON t30.K=x.I JOIN t31 ON t31.K=x.I JOIN t32 ON t32.K=x.I JOIN t33 ON t33.K=x.I JOIN t34 ON t34.K=x.I JOIN t35 ON t35.K=x.I JOIN t36 ON t36.K=x.I JOIN t37 ON t37.K=x.I JOIN t38 ON t38.K=x.I JOIN t39 ON t39.K=x.I JOIN t40 ON t40.K=x.I JOIN t41 ON t41.K=x.I JOIN t42 ON t42.K=x.I JOIN t43 ON t43.K=x.I JOIN t44 ON t44.K=x.I JOIN t45 ON t45.K=x.I JOIN t46 ON t46.K=x.I JOIN t47 ON t47.K=x.I JOIN t48 ON t48.K=x.I JOIN t49 ON t49.K=x.I JOIN t50 ON t50.K=x.I JOIN t51 ON t51.K=x.I JOIN t52 ON t52.K=x.I JOIN t53 ON t53.K=x.I JOIN t54 ON t54.K=x.I JOIN t55 ON t55.K=x.I JOIN t56 ON t56.K=x.I JOIN t57 ON t57.K=x.I JOIN t58 ON t58.K=x.I JOIN t59 ON t59.K=x.I; EXPLAIN SELECT COUNT(*) FROM t1 AS x JOIN t1 ON t1.K=x.I JOIN t2 ON t2.K=x.I JOIN t3 ON t3.K=x.I JOIN t4 ON t4.K=x.I JOIN t5 ON t5.K=x.I JOIN t6 ON t6.K=x.I JOIN t7 ON t7.K=x.I JOIN t8 ON t8.K=x.I JOIN t9 ON t9.K=x.I JOIN t10 ON t10.K=x.I JOIN t11 ON t11.K=x.I JOIN t12 ON t12.K=x.I JOIN t13 ON t13.K=x.I JOIN t14 ON t14.K=x.I JOIN t15 ON t15.K=x.I JOIN t16 ON t16.K=x.I JOIN t17 ON t17.K=x.I JOIN t18 ON t18.K=x.I JOIN t19 ON t19.K=x.I JOIN t20 ON t20.K=x.I JOIN t21 ON t21.K=x.I JOIN t22 ON t22.K=x.I JOIN t23 ON t23.K=x.I JOIN t24 ON t24.K=x.I JOIN t25 ON t25.K=x.I JOIN t26 ON t26.K=x.I JOIN t27 ON t27.K=x.I JOIN t28 ON t28.K=x.I JOIN t29 ON t29.K=x.I JOIN t30 ON t30.K=x.I JOIN t31 ON t31.K=x.I JOIN t32 ON t32.K=x.I JOIN t33 ON t33.K=x.I JOIN t34 ON t34.K=x.I JOIN t35 ON t35.K=x.I JOIN t36 ON t36.K=x.I JOIN t37 ON t37.K=x.I JOIN t38 ON t38.K=x.I JOIN t39 ON t39.K=x.I JOIN t40 ON t40.K=x.I JOIN t41 ON t41.K=x.I JOIN t42 ON t42.K=x.I JOIN t43 ON t43.K=x.I JOIN t44 ON t44.K=x.I JOIN t45 ON t45.K=x.I JOIN t46 ON t46.K=x.I JOIN t47 ON t47.K=x.I JOIN t48 ON t48.K=x.I JOIN t49 ON t49.K=x.I JOIN t50 ON t50.K=x.I JOIN t51 ON t51.K=x.I JOIN t52 ON t52.K=x.I JOIN t53 ON t53.K=x.I JOIN t54 ON t54.K=x.I JOIN t55 ON t55.K=x.I JOIN t56 ON t56.K=x.I JOIN t57 ON t57.K=x.I JOIN t58 ON t58.K=x.I JOIN t59 ON t59.K=x.I JOIN t60 ON t60.K=x.I; DROP TABLE t100, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11, t12, t13, t14, t15, t16, t17, t18, t19, t20, t21, t22, t23, t24, t25, t26, t27, t28, t29, t30, t31, t32, t33, t34, t35, t36, t37, t38, t39, t40, t41, t42, t43, t44, t45, t46, t47, t48, t49, t50, t51, t52, t53, t54, t55, t56, t57, t58, t59, t60, t61; SET OPTIMIZER_SEARCH_DEPTH = DEFAULT; END OF 5.6 TESTS