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| Current File : //home/usr.opt/mysql57/mysql-test/r/wl6711_heap_to_disk.result |
set @old_heap_size= @@max_heap_table_size; set max_heap_table_size = 16384; select * from information_schema.collations order by id limit 1; COLLATION_NAME CHARACTER_SET_NAME ID IS_DEFAULT IS_COMPILED SORTLEN big5_chinese_ci big5 1 Yes Yes 1 set optimizer_switch='firstmatch=off'; set optimizer_switch='loosescan=off'; drop table if exists t1; Warnings: Note 1051 Unknown table 'test.t1' create table t1 ( a int not null, b int not null, c datetime default null ); insert into t1 values (406989,67,'2006-02-23 17:08:46'), (150078,67,'2005-10-26 11:17:45'), (406993,67,'2006-02-27 11:20:57'), (245655,67,'2005-12-08 15:59:08'), (406994,67,'2006-02-27 11:26:46'), (256,67,null), (398341,67,'2006-02-20 04:48:44'), (254,67,null),(1120,67,null), (406988,67,'2006-02-23 17:07:22'), (255,67,null), (398340,67,'2006-02-20 04:38:53'),(406631,67,'2006-02-23 10:49:42'), (245653,67,'2005-12-08 15:59:07'),(406992,67,'2006-02-24 16:47:18'), (245654,67,'2005-12-08 15:59:08'),(406995,67,'2006-02-28 11:55:00'), (127261,67,'2005-10-13 12:17:58'),(406991,67,'2006-02-24 16:42:32'), (245652,67,'2005-12-08 15:58:27'),(398545,67,'2006-02-20 04:53:13'), (154504,67,'2005-10-28 11:53:01'),(9199,67,null),(1,67,'2006-02-23 15:01:35'), (223456,67,null),(4101,67,null),(1133,67,null), (406990,67,'2006-02-23 18:01:45'),(148815,67,'2005-10-25 15:34:17'), (148812,67,'2005-10-25 15:30:01'),(245651,67,'2005-12-08 15:58:27'); insert into t1 select a+10, b+10, c from t1; insert into t1 select a+20, b+20, c from t1; insert into t1 select a+30, b+30, c from t1; insert into t1 select a+40, b+40, c from t1; insert into t1 select a+50, b+50, c from t1; insert into t1 select a+60, b+60, c from t1; insert into t1 select a+70, b+70, c from t1; insert into t1 select a+80, b+80, c from t1; drop table if exists t11; Warnings: Note 1051 Unknown table 'test.t11' create table t11 select * from t1; insert into t1 select a+80, b+80, c from t1; explain select * from t1 where a in (select a from t11) order by 1, 2, 3 limit 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL x 100.00 Using where; Using filesort 1 SIMPLE <subquery2> NULL eq_ref <auto_key> <auto_key> 4 test.t1.a x 100.00 NULL 2 MATERIALIZED t11 NULL ALL NULL NULL NULL NULL x 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` semi join (`test`.`t11`) where (`<subquery2>`.`a` = `test`.`t1`.`a`) order by `test`.`t1`.`a`,`test`.`t1`.`b`,`test`.`t1`.`c` limit 1 select * from t1 where a in (select a from t11) order by 1, 2, 3 limit 1; a b c 1 67 2006-02-23 15:01:35 set optimizer_switch='materialization=off'; explain select * from t1 where a in (select a from t11) order by 1, 2, 3 limit 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t11 NULL ALL NULL NULL NULL NULL x 100.00 Using temporary; Using filesort; Start temporary 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL x 10.00 Using where; End temporary; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` semi join (`test`.`t11`) where (`test`.`t1`.`a` = `test`.`t11`.`a`) order by `test`.`t1`.`a`,`test`.`t1`.`b`,`test`.`t1`.`c` limit 1 select * from t1 where a in (select a from t11) order by 1, 2, 3 limit 1; a b c 1 67 2006-02-23 15:01:35 drop table t11; set optimizer_switch=default; drop table if exists t1, t2; Warnings: Note 1051 Unknown table 'test.t2' CREATE TABLE t1 (id INTEGER); CREATE TABLE t2 (id INTEGER); INSERT INTO t1 (id) VALUES (1), (1), (1),(1); INSERT INTO t1 (id) SELECT id FROM t1; /* 8 */ INSERT INTO t1 (id) SELECT id FROM t1; /* 12 */ INSERT INTO t1 (id) SELECT id FROM t1; /* 16 */ INSERT INTO t1 (id) SELECT id FROM t1; /* 20 */ INSERT INTO t1 (id) SELECT id FROM t1; /* 24 */ INSERT INTO t1 SELECT id+1 FROM t1; INSERT INTO t1 SELECT id+2 FROM t1; INSERT INTO t1 SELECT id+4 FROM t1; INSERT INTO t1 SELECT id+8 FROM t1; INSERT INTO t1 SELECT id+16 FROM t1; INSERT INTO t1 SELECT id+32 FROM t1; INSERT INTO t1 SELECT id+64 FROM t1; INSERT INTO t1 SELECT id+128 FROM t1; INSERT INTO t1 SELECT id+256 FROM t1; INSERT INTO t1 SELECT id+512 FROM t1; INSERT INTO t1 SELECT id+1024 FROM t1; INSERT INTO t2 SELECT id + 2000 FROM t1 limit 4000; explain select * from t1 union select * from t2 order by 1 limit 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL x 100.00 NULL 2 UNION t2 NULL ALL NULL NULL NULL NULL x 100.00 NULL NULL UNION RESULT <union1,2> NULL ALL NULL NULL NULL NULL x NULL Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`id` AS `id` from `test`.`t1` union /* select#2 */ select `test`.`t2`.`id` AS `id` from `test`.`t2` order by `id` limit 1 select * from t1 union select * from t2 order by 1 limit 1; id 1 explain SELECT SUM(id) sm FROM t1 group by id order by sm limit 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL x 100.00 Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select sum(`test`.`t1`.`id`) AS `sm` from `test`.`t1` group by `test`.`t1`.`id` order by `sm` limit 1 SELECT SUM(id) sm FROM t1 group by id order by sm limit 1; sm 128 explain SELECT SUM(DISTINCT t1.id) sm FROM t1 left join t2 on t1.id=t2.id GROUP BY t1.id order by sm limit 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL x 100.00 Using temporary; Using filesort 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL x 100.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select sum(distinct `test`.`t1`.`id`) AS `sm` from `test`.`t1` left join `test`.`t2` on((`test`.`t2`.`id` = `test`.`t1`.`id`)) where 1 group by `test`.`t1`.`id` order by `sm` limit 1 SELECT SUM(DISTINCT t1.id) sm FROM t1 left join t2 on t1.id=t2.id GROUP BY t1.id order by sm limit 1; sm 1 set max_heap_table_size = @old_heap_size; drop table t1; drop table t2; #