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| Current File : //home/usr.opt/mysql57/mysql-test/r/index_merge_myisam.result |
#---------------- Index merge test 1 -------------------------------------------
# (Start of test file: index_merge1.inc)
SET SESSION DEFAULT_STORAGE_ENGINE = MyISAM;
drop table if exists t0, t1, t2, t3, t4;
# Create and fill a table with simple keys
create table t0
(
key1 int not null,
key2 int not null,
key3 int not null,
key4 int not null,
key5 int not null,
key6 int not null,
key7 int not null,
key8 int not null,
INDEX i1(key1),
INDEX i2(key2),
INDEX i3(key3),
INDEX i4(key4),
INDEX i5(key5),
INDEX i6(key6),
INDEX i7(key7),
INDEX i8(key8)
);
analyze table t0;
Table Op Msg_type Msg_text
test.t0 analyze status OK
# 1. One index
explain select * from t0 where key1 < 3 or key1 > 1020;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL range i1 i1 4 NULL 78 100.00 Using index condition
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key1` > 1020))
# 2. Simple cases
explain
select * from t0 where key1 < 3 or key2 > 1020;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2 i1,i2 4,4 NULL 78 100.00 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key2` > 1020))
select * from t0 where key1 < 3 or key2 > 1020;
key1 key2 key3 key4 key5 key6 key7 key8
1 1 1 1 1 1 1 1023
2 2 2 2 2 2 2 1022
1021 1021 1021 1021 1021 1021 1021 3
1022 1022 1022 1022 1022 1022 1022 2
1023 1023 1023 1023 1023 1023 1023 1
1024 1024 1024 1024 1024 1024 1024 0
explain select * from t0 where key1 < 2 or key2 <3;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2 i1,i2 4,4 NULL 5 100.00 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((`test`.`t0`.`key1` < 2) or (`test`.`t0`.`key2` < 3))
explain
select * from t0 where (key1 > 30 and key1<35) or (key2 >32 and key2 < 40);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2 i1,i2 4,4 NULL 11 100.00 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where (((`test`.`t0`.`key1` > 30) and (`test`.`t0`.`key1` < 35)) or ((`test`.`t0`.`key2` > 32) and (`test`.`t0`.`key2` < 40)))
# Bug#21277: InnoDB, wrong result set, index_merge strategy,
# second index not evaluated
select * from t0 where (key1 > 30 and key1<35) or (key2 >32 and key2 < 40);
key1 key2 key3 key4 key5 key6 key7 key8
31 31 31 31 31 31 31 993
32 32 32 32 32 32 32 992
33 33 33 33 33 33 33 991
34 34 34 34 34 34 34 990
35 35 35 35 35 35 35 989
36 36 36 36 36 36 36 988
37 37 37 37 37 37 37 987
38 38 38 38 38 38 38 986
39 39 39 39 39 39 39 985
# 3. Check that index_merge doesn't break "ignore/force/use index"
explain select * from t0 ignore index (i2) where key1 < 3 or key2 <4;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL ALL i1 NULL NULL NULL 1024 55.55 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` IGNORE INDEX (`i2`) where ((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key2` < 4))
explain select * from t0 where (key1 < 3 or key2 <4) and key3 = 50;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL ref i1,i2,i3 i3 4 const 1 55.55 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((`test`.`t0`.`key3` = 50) and ((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key2` < 4)))
explain select * from t0 use index (i1,i2) where (key1 < 2 or key2 <3) and key3 = 50;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2 i1,i2 4,4 NULL 5 1.00 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` USE INDEX (`i2`) USE INDEX (`i1`) where ((`test`.`t0`.`key3` = 50) and ((`test`.`t0`.`key1` < 2) or (`test`.`t0`.`key2` < 3)))
explain select * from t0 where (key1 > 1 or key2 > 2);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL ALL i1,i2 NULL NULL NULL 1024 55.55 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((`test`.`t0`.`key1` > 1) or (`test`.`t0`.`key2` > 2))
explain select * from t0 force index (i1,i2) where (key1 > 1 or key2 > 2);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2 i1,i2 4,4 NULL 1024 100.00 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` FORCE INDEX (`i2`) FORCE INDEX (`i1`) where ((`test`.`t0`.`key1` > 1) or (`test`.`t0`.`key2` > 2))
# 4. Check if conjuncts are grouped by keyuse
explain
select * from t0 where key1<2 or key2<3 or (key1>5 and key1<7) or
(key1>10 and key1<12) or (key2>100 and key2<102);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2 i1,i2 4,4 NULL 8 100.00 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((`test`.`t0`.`key1` < 2) or (`test`.`t0`.`key2` < 3) or ((`test`.`t0`.`key1` > 5) and (`test`.`t0`.`key1` < 7)) or ((`test`.`t0`.`key1` > 10) and (`test`.`t0`.`key1` < 12)) or ((`test`.`t0`.`key2` > 100) and (`test`.`t0`.`key2` < 102)))
# 5. Check index_merge with conjuncts that are always true/false
# verify fallback to "range" if there is only one non-confluent condition
explain select * from t0 where key2 = 45 or key1 <=> null;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL range i1,i2 i2 4 NULL 1 100.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((`test`.`t0`.`key2` = 45) or (`test`.`t0`.`key1` <=> NULL))
explain select * from t0 where key2 = 45 or key1 is not null;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL ALL i1,i2 NULL NULL NULL 1024 90.01 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((`test`.`t0`.`key2` = 45) or (`test`.`t0`.`key1` is not null))
explain select * from t0 where key2 = 45 or key1 is null;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL ref i2 i2 4 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where (`test`.`t0`.`key2` = 45)
# the last conj. is always false and will be discarded
explain select * from t0 where key2=10 or key3=3 or key4 <=> null;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i2,i3,i4 i2,i3 4,4 NULL 2 100.00 Using union(i2,i3); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((`test`.`t0`.`key2` = 10) or (`test`.`t0`.`key3` = 3) or (`test`.`t0`.`key4` <=> NULL))
# the last conj. is always true and will cause 'all' scan
explain select * from t0 where key2=10 or key3=3 or key4 is null;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i2,i3 i2,i3 4,4 NULL 2 100.00 Using union(i2,i3); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((`test`.`t0`.`key2` = 10) or (`test`.`t0`.`key3` = 3))
# some more complicated cases
explain select key1 from t0 where (key1 <=> null) or (key2 < 2) or
(key3=10) or (key4 <=> null);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2,i3,i4 i2,i3 4,4 NULL 3 100.00 Using sort_union(i2,i3); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1` from `test`.`t0` where ((`test`.`t0`.`key1` <=> NULL) or (`test`.`t0`.`key2` < 2) or (`test`.`t0`.`key3` = 10) or (`test`.`t0`.`key4` <=> NULL))
explain select key1 from t0 where (key1 <=> null) or (key1 < 5) or
(key3=10) or (key4 <=> null);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i3,i4 i1,i3 4,4 NULL 6 100.00 Using sort_union(i1,i3); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1` from `test`.`t0` where ((`test`.`t0`.`key1` <=> NULL) or (`test`.`t0`.`key1` < 5) or (`test`.`t0`.`key3` = 10) or (`test`.`t0`.`key4` <=> NULL))
# 6.Several ways to do index_merge, (ignored) index_merge vs. range
explain select * from t0 where
(key1 < 2 or key2 < 2) and (key3 < 3 or key4 < 3) and (key5 < 5 or key6 < 5);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2,i3,i4,i5,i6 i1,i2 4,4 NULL 4 30.86 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where (((`test`.`t0`.`key1` < 2) or (`test`.`t0`.`key2` < 2)) and ((`test`.`t0`.`key3` < 3) or (`test`.`t0`.`key4` < 3)) and ((`test`.`t0`.`key5` < 5) or (`test`.`t0`.`key6` < 5)))
explain
select * from t0 where (key1 < 2 or key2 < 4) and (key1 < 5 or key3 < 3);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2,i3 i1,i2 4,4 NULL 6 100.00 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where (((`test`.`t0`.`key1` < 2) or (`test`.`t0`.`key2` < 4)) and ((`test`.`t0`.`key1` < 5) or (`test`.`t0`.`key3` < 3)))
select * from t0 where (key1 < 2 or key2 < 4) and (key1 < 5 or key3 < 3);
key1 key2 key3 key4 key5 key6 key7 key8
1 1 1 1 1 1 1 1023
2 2 2 2 2 2 2 1022
3 3 3 3 3 3 3 1021
explain select * from t0 where
(key1 < 3 or key2 < 2) and (key3 < 3 or key4 < 3) and (key5 < 2 or key6 < 2);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2,i3,i4,i5,i6 i5,i6 4,4 NULL 4 30.86 Using sort_union(i5,i6); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where (((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key2` < 2)) and ((`test`.`t0`.`key3` < 3) or (`test`.`t0`.`key4` < 3)) and ((`test`.`t0`.`key5` < 2) or (`test`.`t0`.`key6` < 2)))
explain select * from t0 where
(key1 < 3 or key2 < 3) and (key3 < 70);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2,i3 i1,i2 4,4 NULL 6 6.25 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where (((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key2` < 3)) and (`test`.`t0`.`key3` < 70))
explain select * from t0 where
(key1 < 3 or key2 < 3) and (key3 < 1000);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2,i3 i1,i2 4,4 NULL 6 89.16 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where (((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key2` < 3)) and (`test`.`t0`.`key3` < 1000))
# 7. Complex cases
# tree_or(List<SEL_IMERGE>, range SEL_TREE).
explain select * from t0 where
((key1 < 3 or key2 < 3) and (key2 <4 or key3 < 3))
or
key2 > 4;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL ALL i1,i2,i3 NULL NULL NULL 1024 53.90 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key2` < 3)) and ((`test`.`t0`.`key2` < 4) or (`test`.`t0`.`key3` < 3))) or (`test`.`t0`.`key2` > 4))
explain select * from t0 where
((key1 < 4 or key2 < 4) and (key2 <4 or key3 < 3))
or
key1 < 5;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2,i3 i1,i2 4,4 NULL 9 100.00 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((((`test`.`t0`.`key1` < 4) or (`test`.`t0`.`key2` < 4)) and ((`test`.`t0`.`key2` < 4) or (`test`.`t0`.`key3` < 3))) or (`test`.`t0`.`key1` < 5))
select * from t0 where
((key1 < 4 or key2 < 4) and (key2 <4 or key3 < 3))
or
key1 < 5;
key1 key2 key3 key4 key5 key6 key7 key8
1 1 1 1 1 1 1 1023
2 2 2 2 2 2 2 1022
3 3 3 3 3 3 3 1021
4 4 4 4 4 4 4 1020
# tree_or(List<SEL_IMERGE>, List<SEL_IMERGE>).
explain select * from t0 where
((key1 < 2 or key2 < 2) and (key3 <4 or key5 < 3))
or
((key5 < 3 or key6 < 3) and (key7 <3 or key8 < 3));
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2,i3,i5,i6,i7,i8 i1,i2,i5,i6 4,4,4,4 NULL 10 100.00 Using sort_union(i1,i2,i5,i6); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((((`test`.`t0`.`key1` < 2) or (`test`.`t0`.`key2` < 2)) and ((`test`.`t0`.`key3` < 4) or (`test`.`t0`.`key5` < 3))) or (((`test`.`t0`.`key5` < 3) or (`test`.`t0`.`key6` < 3)) and ((`test`.`t0`.`key7` < 3) or (`test`.`t0`.`key8` < 3))))
explain select * from t0 where
((key3 <3 or key5 < 4) and (key1 < 3 or key2 < 3))
or
((key7 <5 or key8 < 3) and (key5 < 4 or key6 < 4));
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2,i3,i5,i6,i7,i8 i3,i5,i7,i8 4,4,4,4 NULL 16 100.00 Using sort_union(i3,i5,i7,i8); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((((`test`.`t0`.`key3` < 3) or (`test`.`t0`.`key5` < 4)) and ((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key2` < 3))) or (((`test`.`t0`.`key7` < 5) or (`test`.`t0`.`key8` < 3)) and ((`test`.`t0`.`key5` < 4) or (`test`.`t0`.`key6` < 4))))
explain select * from t0 where
((key3 <3 or key5 < 4) and (key1 < 3 or key2 < 4))
or
((key3 <4 or key5 < 2) and (key5 < 5 or key6 < 3));
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2,i3,i5,i6 i3,i5 4,4 NULL 8 100.00 Using sort_union(i3,i5); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((((`test`.`t0`.`key3` < 3) or (`test`.`t0`.`key5` < 4)) and ((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key2` < 4))) or (((`test`.`t0`.`key3` < 4) or (`test`.`t0`.`key5` < 2)) and ((`test`.`t0`.`key5` < 5) or (`test`.`t0`.`key6` < 3))))
explain select * from t0 where
((key3 <4 or key5 < 3) and (key1 < 3 or key2 < 3))
or
(((key3 <5 and key7 < 5) or key5 < 2) and (key5 < 4 or key6 < 4));
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2,i3,i5,i6,i7 i3,i5 4,4 NULL 8 100.00 Using sort_union(i3,i5); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((((`test`.`t0`.`key3` < 4) or (`test`.`t0`.`key5` < 3)) and ((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key2` < 3))) or ((((`test`.`t0`.`key3` < 5) and (`test`.`t0`.`key7` < 5)) or (`test`.`t0`.`key5` < 2)) and ((`test`.`t0`.`key5` < 4) or (`test`.`t0`.`key6` < 4))))
explain select * from t0 where
((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
or
((key3 >5 or key5 < 2) and (key5 < 5 or key6 < 6));
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL ALL i1,i2,i3,i5,i6 NULL NULL NULL 1024 52.20 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((((`test`.`t0`.`key3` < 5) or (`test`.`t0`.`key5` < 4)) and ((`test`.`t0`.`key1` < 4) or (`test`.`t0`.`key2` < 4))) or (((`test`.`t0`.`key3` > 5) or (`test`.`t0`.`key5` < 2)) and ((`test`.`t0`.`key5` < 5) or (`test`.`t0`.`key6` < 6))))
explain select * from t0 force index(i1, i2, i3, i4, i5, i6 ) where
((key3 <3 or key5 < 4) and (key1 < 3 or key2 < 3))
or
((key3 >4 or key5 < 2) and (key5 < 5 or key6 < 4));
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2,i3,i5,i6 i3,i5 4,4 NULL 1024 100.00 Using sort_union(i3,i5); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` FORCE INDEX (`i6`) FORCE INDEX (`i5`) FORCE INDEX (`i4`) FORCE INDEX (`i3`) FORCE INDEX (`i2`) FORCE INDEX (`i1`) where ((((`test`.`t0`.`key3` < 3) or (`test`.`t0`.`key5` < 4)) and ((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key2` < 3))) or (((`test`.`t0`.`key3` > 4) or (`test`.`t0`.`key5` < 2)) and ((`test`.`t0`.`key5` < 5) or (`test`.`t0`.`key6` < 4))))
# Can't merge any indexes here (predicate on key3 is always true)
explain select * from t0 force index(i1, i2, i3, i4, i5, i6 ) where
((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
or
((key3 >=5 or key5 < 2) and (key5 < 5 or key6 < 6));
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL ALL i1,i2,i3,i5,i6 NULL NULL NULL 1024 52.20 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` FORCE INDEX (`i6`) FORCE INDEX (`i5`) FORCE INDEX (`i4`) FORCE INDEX (`i3`) FORCE INDEX (`i2`) FORCE INDEX (`i1`) where ((((`test`.`t0`.`key3` < 5) or (`test`.`t0`.`key5` < 4)) and ((`test`.`t0`.`key1` < 4) or (`test`.`t0`.`key2` < 4))) or (((`test`.`t0`.`key3` >= 5) or (`test`.`t0`.`key5` < 2)) and ((`test`.`t0`.`key5` < 5) or (`test`.`t0`.`key6` < 6))))
# 8. Verify that "order by" after index merge uses filesort
select * from t0 where key1 < 3 or key8 < 2 order by key1;
key1 key2 key3 key4 key5 key6 key7 key8
1 1 1 1 1 1 1 1023
2 2 2 2 2 2 2 1022
1023 1023 1023 1023 1023 1023 1023 1
1024 1024 1024 1024 1024 1024 1024 0
explain
select * from t0 where key1 < 3 or key8 < 2 order by key1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i8 i1,i8 4,4 NULL 6 100.00 Using sort_union(i1,i8); Using where; Using filesort
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key8` < 2)) order by `test`.`t0`.`key1`
# 9. Check that index_merge cost is compared to 'index' where possible
create table t2 like t0;
insert into t2 select * from t0;
alter table t2 add index i1_3(key1, key3);
alter table t2 add index i2_3(key2, key3);
alter table t2 drop index i1;
alter table t2 drop index i2;
alter table t2 add index i321(key3, key2, key1);
# index_merge vs 'index', index_merge is better.
explain select key3 from t2 where key1 = 100 or key2 = 100;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 NULL index_merge i1_3,i2_3 i1_3,i2_3 4,4 NULL 2 100.00 Using sort_union(i1_3,i2_3); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t2`.`key3` AS `key3` from `test`.`t2` where ((`test`.`t2`.`key1` = 100) or (`test`.`t2`.`key2` = 100))
# index_merge vs 'index', 'index' is better.
explain select key3 from t2 where key1 <100 or key2 < 100;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 NULL index i1_3,i2_3 i321 12 NULL 1024 55.55 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t2`.`key3` AS `key3` from `test`.`t2` where ((`test`.`t2`.`key1` < 100) or (`test`.`t2`.`key2` < 100))
# index_merge vs 'all', index_merge is better.
explain select key7 from t2 where key1 <100 or key2 < 100;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 NULL ALL i1_3,i2_3 NULL NULL NULL 1024 55.55 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t2`.`key7` AS `key7` from `test`.`t2` where ((`test`.`t2`.`key1` < 100) or (`test`.`t2`.`key2` < 100))
# 10. Multipart keys.
create table t4 (
key1a int not null,
key1b int not null,
key2 int not null,
key2_1 int not null,
key2_2 int not null,
key3 int not null,
index i1a (key1a, key1b),
index i1b (key1b, key1a),
index i2_1(key2, key2_1),
index i2_2(key2, key2_1)
);
Warnings:
Warning 1831 Duplicate index 'i2_2' defined on the table 'test.t4'. This is deprecated and will be disallowed in a future release.
insert into t4 select key1,key1,key1 div 10, key1 % 10, key1 % 10, key1 from t0;
# the following will be handled by index_merge:
select * from t4 where key1a = 3 or key1b = 4;
key1a key1b key2 key2_1 key2_2 key3
3 3 0 3 3 3
4 4 0 4 4 4
explain select * from t4 where key1a = 3 or key1b = 4;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t4 NULL index_merge i1a,i1b i1a,i1b 4,4 NULL 2 100.00 Using sort_union(i1a,i1b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t4`.`key1a` AS `key1a`,`test`.`t4`.`key1b` AS `key1b`,`test`.`t4`.`key2` AS `key2`,`test`.`t4`.`key2_1` AS `key2_1`,`test`.`t4`.`key2_2` AS `key2_2`,`test`.`t4`.`key3` AS `key3` from `test`.`t4` where ((`test`.`t4`.`key1a` = 3) or (`test`.`t4`.`key1b` = 4))
# and the following will not
explain select * from t4 where key2 = 1 and (key2_1 = 1 or key3 = 5);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t4 NULL ref i2_1,i2_2 i2_1 4 const 10 19.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t4`.`key1a` AS `key1a`,`test`.`t4`.`key1b` AS `key1b`,`test`.`t4`.`key2` AS `key2`,`test`.`t4`.`key2_1` AS `key2_1`,`test`.`t4`.`key2_2` AS `key2_2`,`test`.`t4`.`key3` AS `key3` from `test`.`t4` where ((`test`.`t4`.`key2` = 1) and ((`test`.`t4`.`key2_1` = 1) or (`test`.`t4`.`key3` = 5)))
explain select * from t4 where key2 = 1 and (key2_1 = 1 or key2_2 = 5);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t4 NULL ref i2_1,i2_2 i2_1 4 const 10 19.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t4`.`key1a` AS `key1a`,`test`.`t4`.`key1b` AS `key1b`,`test`.`t4`.`key2` AS `key2`,`test`.`t4`.`key2_1` AS `key2_1`,`test`.`t4`.`key2_2` AS `key2_2`,`test`.`t4`.`key3` AS `key3` from `test`.`t4` where ((`test`.`t4`.`key2` = 1) and ((`test`.`t4`.`key2_1` = 1) or (`test`.`t4`.`key2_2` = 5)))
explain select * from t4 where key2_1 = 1 or key2_2 = 5;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t4 NULL ALL NULL NULL NULL NULL 1024 19.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t4`.`key1a` AS `key1a`,`test`.`t4`.`key1b` AS `key1b`,`test`.`t4`.`key2` AS `key2`,`test`.`t4`.`key2_1` AS `key2_1`,`test`.`t4`.`key2_2` AS `key2_2`,`test`.`t4`.`key3` AS `key3` from `test`.`t4` where ((`test`.`t4`.`key2_1` = 1) or (`test`.`t4`.`key2_2` = 5))
# 11. Multitable selects
create table t1 like t0;
insert into t1 select * from t0;
# index_merge on first table in join
explain select * from t0 left join t1 on (t0.key1=t1.key1)
where t0.key1=3 or t0.key2=4;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2 i1,i2 4,4 NULL 2 100.00 Using union(i1,i2); Using where
1 SIMPLE t1 NULL ref i1 i1 4 test.t0.key1 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`key5` AS `key5`,`test`.`t1`.`key6` AS `key6`,`test`.`t1`.`key7` AS `key7`,`test`.`t1`.`key8` AS `key8` from `test`.`t0` left join `test`.`t1` on((`test`.`t1`.`key1` = `test`.`t0`.`key1`)) where ((`test`.`t0`.`key1` = 3) or (`test`.`t0`.`key2` = 4))
select * from t0 left join t1 on (t0.key1=t1.key1)
where t0.key1=3 or t0.key2=4;
key1 key2 key3 key4 key5 key6 key7 key8 key1 key2 key3 key4 key5 key6 key7 key8
3 3 3 3 3 3 3 1021 3 3 3 3 3 3 3 1021
4 4 4 4 4 4 4 1020 4 4 4 4 4 4 4 1020
explain
select * from t0,t1 where (t0.key1=t1.key1) and ( t0.key1=3 or t0.key2=4);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2 i1,i2 4,4 NULL 2 100.00 Using union(i1,i2); Using where
1 SIMPLE t1 NULL ref i1 i1 4 test.t0.key1 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`key5` AS `key5`,`test`.`t1`.`key6` AS `key6`,`test`.`t1`.`key7` AS `key7`,`test`.`t1`.`key8` AS `key8` from `test`.`t0` join `test`.`t1` where ((`test`.`t1`.`key1` = `test`.`t0`.`key1`) and ((`test`.`t0`.`key1` = 3) or (`test`.`t0`.`key2` = 4)))
# index_merge vs. ref
explain
select * from t0,t1 where (t0.key1=t1.key1) and
(t0.key1=3 or t0.key2=4) and t1.key1<200;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2 i1,i2 4,4 NULL 2 100.00 Using union(i1,i2); Using where
1 SIMPLE t1 NULL ref i1 i1 4 test.t0.key1 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`key5` AS `key5`,`test`.`t1`.`key6` AS `key6`,`test`.`t1`.`key7` AS `key7`,`test`.`t1`.`key8` AS `key8` from `test`.`t0` join `test`.`t1` where ((`test`.`t1`.`key1` = `test`.`t0`.`key1`) and ((`test`.`t0`.`key1` = 3) or (`test`.`t0`.`key2` = 4)) and (`test`.`t0`.`key1` < 200))
# index_merge vs. ref
explain
select * from t0,t1 where (t0.key1=t1.key1) and
(t0.key1=3 or t0.key2<4) and t1.key1=2;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL ref i1,i2 i1 4 const 1 5.00 Using where
1 SIMPLE t1 NULL ref i1 i1 4 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`key5` AS `key5`,`test`.`t1`.`key6` AS `key6`,`test`.`t1`.`key7` AS `key7`,`test`.`t1`.`key8` AS `key8` from `test`.`t0` join `test`.`t1` where ((`test`.`t0`.`key1` = 2) and (`test`.`t1`.`key1` = 2) and (`test`.`t0`.`key2` < 4))
# index_merge on second table in join
explain select * from t0,t1 where t0.key1 = 5 and
(t1.key1 = t0.key1 or t1.key8 = t0.key1);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL ref i1 i1 4 const 1 100.00 NULL
1 SIMPLE t1 NULL index_merge i1,i8 i1,i8 4,4 NULL 2 100.00 Using union(i1,i8); Using where; Using join buffer (Block Nested Loop)
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`key5` AS `key5`,`test`.`t1`.`key6` AS `key6`,`test`.`t1`.`key7` AS `key7`,`test`.`t1`.`key8` AS `key8` from `test`.`t0` join `test`.`t1` where ((`test`.`t0`.`key1` = 5) and ((`test`.`t1`.`key1` = 5) or (`test`.`t1`.`key8` = 5)))
# Fix for bug#1974
explain select * from t0,t1 where t0.key1 < 3 and
(t1.key1 = t0.key1 or t1.key8 = t0.key1);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL range i1 i1 4 NULL 3 100.00 Using index condition
1 SIMPLE t1 NULL ALL i1,i8 NULL NULL NULL 1024 0.20 Range checked for each record (index map: 0x81)
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`key5` AS `key5`,`test`.`t1`.`key6` AS `key6`,`test`.`t1`.`key7` AS `key7`,`test`.`t1`.`key8` AS `key8` from `test`.`t0` join `test`.`t1` where ((`test`.`t0`.`key1` < 3) and ((`test`.`t1`.`key1` = `test`.`t0`.`key1`) or (`test`.`t1`.`key8` = `test`.`t0`.`key1`)))
# index_merge inside union
explain select * from t1 where key1=3 or key2=4
union select * from t1 where key1<4 or key3=5;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 NULL index_merge i1,i2 i1,i2 4,4 NULL 2 100.00 Using union(i1,i2); Using where
2 UNION t1 NULL index_merge i1,i3 i1,i3 4,4 NULL 5 100.00 Using sort_union(i1,i3); Using where
NULL UNION RESULT <union1,2> NULL ALL NULL NULL NULL NULL NULL NULL Using temporary
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`key5` AS `key5`,`test`.`t1`.`key6` AS `key6`,`test`.`t1`.`key7` AS `key7`,`test`.`t1`.`key8` AS `key8` from `test`.`t1` where ((`test`.`t1`.`key1` = 3) or (`test`.`t1`.`key2` = 4)) union /* select#2 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`key5` AS `key5`,`test`.`t1`.`key6` AS `key6`,`test`.`t1`.`key7` AS `key7`,`test`.`t1`.`key8` AS `key8` from `test`.`t1` where ((`test`.`t1`.`key1` < 4) or (`test`.`t1`.`key3` = 5))
# index merge in subselect
explain select * from (select * from t1 where key1 = 3 or key2 =3) as z where key8 >5;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge i1,i2,i8 i1,i2 4,4 NULL 2 99.51 Using union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`key5` AS `key5`,`test`.`t1`.`key6` AS `key6`,`test`.`t1`.`key7` AS `key7`,`test`.`t1`.`key8` AS `key8` from `test`.`t1` where ((`test`.`t1`.`key8` > 5) and ((`test`.`t1`.`key1` = 3) or (`test`.`t1`.`key2` = 3)))
# 12. check for long index_merges.
create table t3 like t0;
insert into t3 select * from t0;
alter table t3 add key9 int not null, add index i9(key9);
alter table t3 add keyA int not null, add index iA(keyA);
alter table t3 add keyB int not null, add index iB(keyB);
alter table t3 add keyC int not null, add index iC(keyC);
update t3 set key9=key1,keyA=key1,keyB=key1,keyC=key1;
explain select * from t3 where
key1=1 or key2=2 or key3=3 or key4=4 or
key5=5 or key6=6 or key7=7 or key8=8 or
key9=9 or keyA=10 or keyB=11 or keyC=12;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t3 NULL index_merge i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC 4,4,4,4,4,4,4,4,4,4,4,4 NULL 12 100.00 Using union(i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t3`.`key1` AS `key1`,`test`.`t3`.`key2` AS `key2`,`test`.`t3`.`key3` AS `key3`,`test`.`t3`.`key4` AS `key4`,`test`.`t3`.`key5` AS `key5`,`test`.`t3`.`key6` AS `key6`,`test`.`t3`.`key7` AS `key7`,`test`.`t3`.`key8` AS `key8`,`test`.`t3`.`key9` AS `key9`,`test`.`t3`.`keyA` AS `keyA`,`test`.`t3`.`keyB` AS `keyB`,`test`.`t3`.`keyC` AS `keyC` from `test`.`t3` where ((`test`.`t3`.`key1` = 1) or (`test`.`t3`.`key2` = 2) or (`test`.`t3`.`key3` = 3) or (`test`.`t3`.`key4` = 4) or (`test`.`t3`.`key5` = 5) or (`test`.`t3`.`key6` = 6) or (`test`.`t3`.`key7` = 7) or (`test`.`t3`.`key8` = 8) or (`test`.`t3`.`key9` = 9) or (`test`.`t3`.`keyA` = 10) or (`test`.`t3`.`keyB` = 11) or (`test`.`t3`.`keyC` = 12))
select * from t3 where
key1=1 or key2=2 or key3=3 or key4=4 or
key5=5 or key6=6 or key7=7 or key8=8 or
key9=9 or keyA=10 or keyB=11 or keyC=12;
key1 key2 key3 key4 key5 key6 key7 key8 key9 keyA keyB keyC
1 1 1 1 1 1 1 1023 1 1 1 1
2 2 2 2 2 2 2 1022 2 2 2 2
3 3 3 3 3 3 3 1021 3 3 3 3
4 4 4 4 4 4 4 1020 4 4 4 4
5 5 5 5 5 5 5 1019 5 5 5 5
6 6 6 6 6 6 6 1018 6 6 6 6
7 7 7 7 7 7 7 1017 7 7 7 7
9 9 9 9 9 9 9 1015 9 9 9 9
10 10 10 10 10 10 10 1014 10 10 10 10
11 11 11 11 11 11 11 1013 11 11 11 11
12 12 12 12 12 12 12 1012 12 12 12 12
1016 1016 1016 1016 1016 1016 1016 8 1016 1016 1016 1016
# Test for Bug#3183
explain select * from t0 where key1 < 3 or key2 < 4;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 NULL index_merge i1,i2 i1,i2 4,4 NULL 7 100.00 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t0`.`key1` AS `key1`,`test`.`t0`.`key2` AS `key2`,`test`.`t0`.`key3` AS `key3`,`test`.`t0`.`key4` AS `key4`,`test`.`t0`.`key5` AS `key5`,`test`.`t0`.`key6` AS `key6`,`test`.`t0`.`key7` AS `key7`,`test`.`t0`.`key8` AS `key8` from `test`.`t0` where ((`test`.`t0`.`key1` < 3) or (`test`.`t0`.`key2` < 4))
# Bug#21277: InnoDB, wrong result set, index_merge strategy,
# second index not evaluated
select * from t0 where key1 < 3 or key2 < 4;
key1 key2 key3 key4 key5 key6 key7 key8
1 1 1 1 1 1 1 1023
2 2 2 2 2 2 2 1022
3 3 3 3 3 3 3 1021
update t0 set key8=123 where key1 < 3 or key2 < 4;
# Bug#21277: InnoDB, wrong result set, index_merge strategy,
# second index not evaluated
select * from t0 where key1 < 3 or key2 < 4;
key1 key2 key3 key4 key5 key6 key7 key8
1 1 1 1 1 1 1 123
2 2 2 2 2 2 2 123
3 3 3 3 3 3 3 123
delete from t0 where key1 < 3 or key2 < 4;
select * from t0 where key1 < 3 or key2 < 4;
key1 key2 key3 key4 key5 key6 key7 key8
select count(*) from t0;
count(*)
1021
# Test for BUG#4177
drop table t4;
create table t4 (a int);
insert into t4 values (1),(4),(3);
set @save_join_buffer_size=@@join_buffer_size;
set join_buffer_size= 4096;
explain select max(a.key1 + b.key1 + a.key2 + b.key2 + a.key3 + b.key3 + a.key4 + b.key4 + a.key5 + b.key5)
from t0 as a force index(i1,i2), t0 as b force index (i1,i2)
where (a.key1 < 500000 or a.key2 < 3)
and (b.key1 < 500000 or b.key2 < 3);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE a NULL index_merge i1,i2 i1,i2 4,4 NULL 1013 100.00 Using sort_union(i1,i2); Using where
1 SIMPLE b NULL index_merge i1,i2 i1,i2 4,4 NULL 1013 100.00 Using sort_union(i1,i2); Using where; Using join buffer (Block Nested Loop)
Warnings:
Note 1003 /* select#1 */ select max((((((((((`test`.`a`.`key1` + `test`.`b`.`key1`) + `test`.`a`.`key2`) + `test`.`b`.`key2`) + `test`.`a`.`key3`) + `test`.`b`.`key3`) + `test`.`a`.`key4`) + `test`.`b`.`key4`) + `test`.`a`.`key5`) + `test`.`b`.`key5`)) AS `max(a.key1 + b.key1 + a.key2 + b.key2 + a.key3 + b.key3 + a.key4 + b.key4 + a.key5 + b.key5)` from `test`.`t0` `a` FORCE INDEX (`i2`) FORCE INDEX (`i1`) join `test`.`t0` `b` FORCE INDEX (`i2`) FORCE INDEX (`i1`) where (((`test`.`a`.`key1` < 500000) or (`test`.`a`.`key2` < 3)) and ((`test`.`b`.`key1` < 500000) or (`test`.`b`.`key2` < 3)))
select max(a.key1 + b.key1 + a.key2 + b.key2 + a.key3 + b.key3 + a.key4 + b.key4 + a.key5 + b.key5)
from t0 as a force index(i1,i2), t0 as b force index (i1,i2)
where (a.key1 < 500000 or a.key2 < 3)
and (b.key1 < 500000 or b.key2 < 3);
max(a.key1 + b.key1 + a.key2 + b.key2 + a.key3 + b.key3 + a.key4 + b.key4 + a.key5 + b.key5)
10240
update t0 set key1=1;
explain select max(a.key1 + b.key1 + a.key2 + b.key2 + a.key3 + b.key3 + a.key4 + b.key4 + a.key5 + b.key5)
from t0 as a force index(i1,i2), t0 as b force index (i1,i2)
where (a.key1 = 1 or a.key2 = 1)
and (b.key1 = 1 or b.key2 = 1);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE a NULL index_merge i1,i2 i1,i2 4,4 NULL 1020 100.00 Using union(i1,i2); Using where
1 SIMPLE b NULL index_merge i1,i2 i1,i2 4,4 NULL 1020 100.00 Using union(i1,i2); Using where; Using join buffer (Block Nested Loop)
Warnings:
Note 1003 /* select#1 */ select max((((((((((`test`.`a`.`key1` + `test`.`b`.`key1`) + `test`.`a`.`key2`) + `test`.`b`.`key2`) + `test`.`a`.`key3`) + `test`.`b`.`key3`) + `test`.`a`.`key4`) + `test`.`b`.`key4`) + `test`.`a`.`key5`) + `test`.`b`.`key5`)) AS `max(a.key1 + b.key1 + a.key2 + b.key2 + a.key3 + b.key3 + a.key4 + b.key4 + a.key5 + b.key5)` from `test`.`t0` `a` FORCE INDEX (`i2`) FORCE INDEX (`i1`) join `test`.`t0` `b` FORCE INDEX (`i2`) FORCE INDEX (`i1`) where (((`test`.`a`.`key1` = 1) or (`test`.`a`.`key2` = 1)) and ((`test`.`b`.`key1` = 1) or (`test`.`b`.`key2` = 1)))
select max(a.key1 + b.key1 + a.key2 + b.key2 + a.key3 + b.key3 + a.key4 + b.key4 + a.key5 + b.key5)
from t0 as a force index(i1,i2), t0 as b force index (i1,i2)
where (a.key1 = 1 or a.key2 = 1)
and (b.key1 = 1 or b.key2 = 1);
max(a.key1 + b.key1 + a.key2 + b.key2 + a.key3 + b.key3 + a.key4 + b.key4 + a.key5 + b.key5)
8194
alter table t0 add filler1 char(200), add filler2 char(200), add filler3 char(200);
update t0 set key2=1, key3=1, key4=1, key5=1,key6=1,key7=1 where key7 < 500;
# The next query will not use index i7 in intersection if the OS doesn't
# support file sizes > 2GB. (ha_myisam::ref_length depends on this and index
# scan cost estimates depend on ha_myisam::ref_length)
explain select max(a.key1 + b.key1 + a.key2 + b.key2 + a.key3 + b.key3 + a.key4 + b.key4 + a.key5 + b.key5)
from t0 as a, t0 as b
where (a.key1 = 1 and a.key2 = 1 and a.key3 = 1 and a.key4=1 and a.key5=1 and a.key6=1 and a.key7 = 1 or a.key8=1)
and (b.key1 = 1 and b.key2 = 1 and b.key3 = 1 and b.key4=1 and b.key5=1 and b.key6=1 and b.key7 = 1 or b.key8=1);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE a NULL index_merge i1,i2,i3,i4,i5,i6,i7?,i8 i2,i3,i4,i5,i6,i7?,i8 X NULL # # Using union(intersect(i2,i3,i4,i5,i6,i7?),i8); Using where
1 SIMPLE b NULL index_merge i1,i2,i3,i4,i5,i6,i7?,i8 i2,i3,i4,i5,i6,i7?,i8 X NULL # # Using union(intersect(i2,i3,i4,i5,i6,i7?),i8); Using where; Using join buffer (Block Nested Loop)
Warnings:
Note 1003 /* select#1 */ select max((((((((((`test`.`a`.`key1` + `test`.`b`.`key1`) + `test`.`a`.`key2`) + `test`.`b`.`key2`) + `test`.`a`.`key3`) + `test`.`b`.`key3`) + `test`.`a`.`key4`) + `test`.`b`.`key4`) + `test`.`a`.`key5`) + `test`.`b`.`key5`)) AS `max(a.key1 + b.key1 + a.key2 + b.key2 + a.key3 + b.key3 + a.key4 + b.key4 + a.key5 + b.key5)` from `test`.`t0` `a` join `test`.`t0` `b` where ((((`test`.`a`.`key7` = 1) and (`test`.`a`.`key6` = 1) and (`test`.`a`.`key5` = 1) and (`test`.`a`.`key4` = 1) and (`test`.`a`.`key3` = 1) and (`test`.`a`.`key2` = 1) and (`test`.`a`.`key1` = 1)) or (`test`.`a`.`key8` = 1)) and (((`test`.`b`.`key7` = 1) and (`test`.`b`.`key6` = 1) and (`test`.`b`.`key5` = 1) and (`test`.`b`.`key4` = 1) and (`test`.`b`.`key3` = 1) and (`test`.`b`.`key2` = 1) and (`test`.`b`.`key1` = 1)) or (`test`.`b`.`key8` = 1)))
select max(a.key1 + b.key1 + a.key2 + b.key2 + a.key3 + b.key3 + a.key4 + b.key4 + a.key5 + b.key5)
from t0 as a, t0 as b
where (a.key1 = 1 and a.key2 = 1 and a.key3 = 1 and a.key4=1 and a.key5=1 and a.key6=1 and a.key7 = 1 or a.key8=1)
and (b.key1 = 1 and b.key2 = 1 and b.key3 = 1 and b.key4=1 and b.key5=1 and b.key6=1 and b.key7 = 1 or b.key8=1);
max(a.key1 + b.key1 + a.key2 + b.key2 + a.key3 + b.key3 + a.key4 + b.key4 + a.key5 + b.key5)
8186
set join_buffer_size= @save_join_buffer_size;
# Test for BUG#4177 ends
drop table t0, t1, t2, t3, t4;
# BUG#16166
CREATE TABLE t1 (
cola char(3) not null, colb char(3) not null, filler char(200),
key(cola), key(colb)
);
INSERT INTO t1 VALUES ('foo','bar', 'ZZ'),('fuz','baz', 'ZZ');
OPTIMIZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 optimize status OK
select count(*) from t1;
count(*)
8704
explain select * from t1 WHERE cola = 'foo' AND colb = 'bar';
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge cola,colb cola,colb 3,3 NULL 32 100.00 Using intersect(cola,colb); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`cola` AS `cola`,`test`.`t1`.`colb` AS `colb`,`test`.`t1`.`filler` AS `filler` from `test`.`t1` where ((`test`.`t1`.`colb` = 'bar') and (`test`.`t1`.`cola` = 'foo'))
explain select * from t1 force index(cola,colb) WHERE cola = 'foo' AND colb = 'bar';
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge cola,colb cola,colb 3,3 NULL 32 100.00 Using intersect(cola,colb); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`cola` AS `cola`,`test`.`t1`.`colb` AS `colb`,`test`.`t1`.`filler` AS `filler` from `test`.`t1` FORCE INDEX (`colb`) FORCE INDEX (`cola`) where ((`test`.`t1`.`colb` = 'bar') and (`test`.`t1`.`cola` = 'foo'))
drop table t1;
#
# BUG#17314: Index_merge/intersection not choosen by the
# optimizer for MERGE tables
#
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (
a int, b int,
filler1 char(200), filler2 char(200),
key(a),key(b)
);
insert into t1 select @v:= A.a, @v, 't1', 'filler2' from t0 A, t0 B, t0 C;
create table t2 like t1;
create table t3 (
a int, b int,
filler1 char(200), filler2 char(200),
key(a),key(b)
) engine=merge union=(t1,t2);
explain select * from t1 where a=1 and b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b a,b 5,5 NULL # 100.00 Using intersect(a,b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`b` = 1) and (`test`.`t1`.`a` = 1))
explain select * from t3 where a=1 and b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t3 NULL index_merge a,b a,b 5,5 NULL # 100.00 Using intersect(a,b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t3`.`filler1` AS `filler1`,`test`.`t3`.`filler2` AS `filler2` from `test`.`t3` where ((`test`.`t3`.`b` = 1) and (`test`.`t3`.`a` = 1))
drop table t3;
drop table t0, t1, t2;
#
# BUG#20256 - LOCK WRITE - MyISAM
#
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES(1);
CREATE TABLE t2(a INT, b INT, dummy CHAR(16) DEFAULT '', KEY(a), KEY(b));
INSERT INTO t2(a,b) VALUES
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(1,2);
LOCK TABLES t1 WRITE, t2 WRITE;
INSERT INTO t2(a,b) VALUES(1,2);
SELECT t2.a FROM t1,t2 WHERE t2.b=2 AND t2.a=1;
a
1
1
UNLOCK TABLES;
DROP TABLE t1, t2;
#
# BUG#29740: HA_KEY_SCAN_NOT_ROR wasn't set for HEAP engine
#
CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL,
`filler` char(200) DEFAULT NULL,
`b` int(11) DEFAULT NULL,
KEY `a` (`a`),
KEY `b` (`b`)
) ENGINE=MEMORY DEFAULT CHARSET=latin1;
insert into t1 values
(0, 'filler', 0), (1, 'filler', 1), (2, 'filler', 2), (3, 'filler', 3),
(4, 'filler', 4), (5, 'filler', 5), (6, 'filler', 6), (7, 'filler', 7),
(8, 'filler', 8), (9, 'filler', 9), (0, 'filler', 0), (1, 'filler', 1),
(2, 'filler', 2), (3, 'filler', 3), (4, 'filler', 4), (5, 'filler', 5),
(6, 'filler', 6), (7, 'filler', 7), (8, 'filler', 8), (9, 'filler', 9),
(10, 'filler', 10), (11, 'filler', 11), (12, 'filler', 12), (13, 'filler', 13),
(14, 'filler', 14), (15, 'filler', 15), (16, 'filler', 16), (17, 'filler', 17),
(18, 'filler', 18), (19, 'filler', 19), (4, '5 ', 0), (5, '4 ', 0),
(4, '4 ', 0), (4, 'qq ', 5), (5, 'qq ', 4), (4, 'zz ', 4);
create table t2(
`a` int(11) DEFAULT NULL,
`filler` char(200) DEFAULT NULL,
`b` int(11) DEFAULT NULL,
KEY USING BTREE (`a`),
KEY USING BTREE (`b`)
) ENGINE=MEMORY DEFAULT CHARSET=latin1;
insert into t2 select * from t1;
must use sort-union rather than union:
explain select * from t1 where a=4 or b=4;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b a,b 5,5 NULL # 100.00 Using sort_union(a,b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`filler` AS `filler`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`a` = 4) or (`test`.`t1`.`b` = 4))
select * from t1 where a=4 or b=4;
a filler b
4 4 0
4 5 0
4 filler 4
4 filler 4
4 qq 5
4 zz 4
5 qq 4
select * from t1 ignore index(a,b) where a=4 or b=4;
a filler b
4 4 0
4 5 0
4 filler 4
4 filler 4
4 qq 5
4 zz 4
5 qq 4
must use union, not sort-union:
explain select * from t2 where a=4 or b=4;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 NULL index_merge a,b a,b 5,5 NULL # 100.00 Using union(a,b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`filler` AS `filler`,`test`.`t2`.`b` AS `b` from `test`.`t2` where ((`test`.`t2`.`a` = 4) or (`test`.`t2`.`b` = 4))
select * from t2 where a=4 or b=4;
a filler b
4 4 0
4 5 0
4 filler 4
4 filler 4
4 qq 5
4 zz 4
5 qq 4
drop table t1, t2;
#
# Bug #37943: Reproducible mysqld crash/sigsegv in sel_trees_can_be_ored
#
CREATE TABLE t1 (a varchar(8), b set('a','b','c','d','e','f','g','h'),
KEY b(b), KEY a(a));
INSERT INTO t1 VALUES ('y',''), ('z','');
SELECT b,a from t1 WHERE (b!='c' AND b!='f' && b!='h') OR
(a='pure-S') OR (a='DE80337a') OR (a='DE80799');
b a
y
z
DROP TABLE t1;
#
# BUG#40974: Incorrect query results when using clause
# evaluated using range check
#
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a int);
insert into t1 values (1),(2);
create table t2(a int, b int);
insert into t2 values (1,1), (2, 1000);
create table t3 (a int, b int, filler char(100), key(a), key(b));
insert into t3 select 1000, 1000,'filler' from t0 A, t0 B, t0 C;
insert into t3 values (1,1,'data');
insert into t3 values (1,1,'data');
The plan should be ALL/ALL/ALL(Range checked for each record (index map: 0x3)
explain select * from t1
where exists (select 1 from t2, t3
where t2.a=t1.a and (t3.a=t2.b or t3.b=t2.b or t3.b=t2.b+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 2 100.00 Using where
2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 2 50.00 Using where
2 DEPENDENT SUBQUERY t3 NULL ALL a,b NULL NULL NULL 1002 77.50 Range checked for each record (index map: 0x3)
Warnings:
Note 1276 Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where exists(/* select#2 */ select 1 from `test`.`t2` join `test`.`t3` where ((`test`.`t2`.`a` = `test`.`t1`.`a`) and ((`test`.`t3`.`a` = `test`.`t2`.`b`) or (`test`.`t3`.`b` = `test`.`t2`.`b`) or (`test`.`t3`.`b` = (`test`.`t2`.`b` + 1)))))
select * from t1
where exists (select 1 from t2, t3
where t2.a=t1.a and (t3.a=t2.b or t3.b=t2.b or t3.b=t2.b+1));
a
1
2
drop table t0, t1, t2, t3;
#
# BUG#44810: index merge and order by with low sort_buffer_size
# crashes server!
#
CREATE TABLE t1(a VARCHAR(128),b VARCHAR(128),KEY(A),KEY(B));
INSERT INTO t1 VALUES (REPEAT('a',128),REPEAT('b',128));
INSERT INTO t1 SELECT * FROM t1;
INSERT INTO t1 SELECT * FROM t1;
INSERT INTO t1 SELECT * FROM t1;
INSERT INTO t1 SELECT * FROM t1;
INSERT INTO t1 SELECT * FROM t1;
INSERT INTO t1 SELECT * FROM t1;
SET SESSION sort_buffer_size=1;
Warnings:
Warning 1292 Truncated incorrect sort_buffer_size value: '1'
EXPLAIN
SELECT * FROM t1 FORCE INDEX(a,b) WHERE a LIKE 'a%' OR b LIKE 'b%'
ORDER BY a,b;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b a,b 131,131 NULL 64 100.00 Using sort_union(a,b); Using where; Using filesort
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` FORCE INDEX (`b`) FORCE INDEX (`a`) where ((`test`.`t1`.`a` like 'a%') or (`test`.`t1`.`b` like 'b%')) order by `test`.`t1`.`a`,`test`.`t1`.`b`
# we don't actually care about the result : we're checking if it crashes
SELECT * FROM t1 FORCE INDEX(a,b) WHERE a LIKE 'a%' OR b LIKE 'b%'
ORDER BY a,b;
SET SESSION sort_buffer_size=DEFAULT;
DROP TABLE t1;
End of 5.0 tests
#---------------- ROR-index_merge tests -----------------------
# (Start of test file: index_merge_ror.inc)
SET SESSION DEFAULT_STORAGE_ENGINE = MyISAM;
drop table if exists t0,t1,t2;
create table t1
(
/* Field names reflect value(rowid) distribution, st=STairs, swt= SaWTooth */
st_a int not null default 0,
swt1a int not null default 0,
swt2a int not null default 0,
st_b int not null default 0,
swt1b int not null default 0,
swt2b int not null default 0,
/* fields/keys for row retrieval tests */
key1 int,
key2 int,
key3 int,
key4 int,
/* make rows much bigger then keys */
filler1 char (200),
filler2 char (200),
filler3 char (200),
filler4 char (200),
filler5 char (200),
filler6 char (200),
/* order of keys is important */
key sta_swt12a(st_a,swt1a,swt2a),
key sta_swt1a(st_a,swt1a),
key sta_swt2a(st_a,swt2a),
key sta_swt21a(st_a,swt2a,swt1a),
key st_a(st_a),
key stb_swt1a_2b(st_b,swt1b,swt2a),
key stb_swt1b(st_b,swt1b),
key st_b(st_b),
key(key1),
key(key2),
key(key3),
key(key4)
) ;
create table t0 as select * from t1;
# Printing of many insert into t0 values (....) disabled.
alter table t1 disable keys;
# Printing of many insert into t1 select .... from t0 disabled.
# Printing of many insert into t1 (...) values (....) disabled.
alter table t1 enable keys;
select count(*) from t1;
count(*)
64801
# One row results tests for cases where a single row matches all conditions
explain select key1,key2 from t1 where key1=100 and key2=100;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2 key1,key2 5,5 NULL 77 100.00 Using intersect(key1,key2); Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2` from `test`.`t1` where ((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100))
select key1,key2 from t1 where key1=100 and key2=100;
key1 key2
100 100
explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 154 100.00 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1` from `test`.`t1` where (((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100)) or ((`test`.`t1`.`key4` = 100) and (`test`.`t1`.`key3` = 100)))
explain format=json select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
EXPLAIN
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "411.69"
},
"table": {
"table_name": "t1",
"access_type": "index_merge",
"possible_keys": [
"key1",
"key2",
"key3",
"key4"
],
"key": "union(intersect(key1,key2),intersect(key3,key4))",
"key_length": "5,5,5,5",
"rows_examined_per_scan": 154,
"rows_produced_per_join": 154,
"filtered": "100.00",
"cost_info": {
"read_cost": "380.90",
"eval_cost": "30.80",
"prefix_cost": "411.70",
"data_read_per_join": "187K"
},
"used_columns": [
"key1",
"key2",
"key3",
"key4",
"filler1"
],
"attached_condition": "(((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100)) or ((`test`.`t1`.`key4` = 100) and (`test`.`t1`.`key3` = 100)))"
}
}
}
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1` from `test`.`t1` where (((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100)) or ((`test`.`t1`.`key4` = 100) and (`test`.`t1`.`key3` = 100)))
select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
key1 key2 key3 key4 filler1
100 100 100 100 key1-key2-key3-key4
# Several-rows results
insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, -1, -1, 'key1-key2');
insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, 100, 100, 'key4-key3');
# ROR-intersection, not covering
explain select key1,key2,filler1 from t1 where key1=100 and key2=100;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2 key1,key2 5,5 NULL 77 100.00 Using intersect(key1,key2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`filler1` AS `filler1` from `test`.`t1` where ((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100))
select key1,key2,filler1 from t1 where key1=100 and key2=100;
key1 key2 filler1
100 100 key1-key2-key3-key4
100 100 key1-key2
# ROR-intersection, covering
explain select key1,key2 from t1 where key1=100 and key2=100;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2 key1,key2 5,5 NULL 77 100.00 Using intersect(key1,key2); Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2` from `test`.`t1` where ((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100))
select key1,key2 from t1 where key1=100 and key2=100;
key1 key2
100 100
100 100
# ROR-union of ROR-intersections
explain select key1,key2,key3,key4 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 154 100.00 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4` from `test`.`t1` where (((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100)) or ((`test`.`t1`.`key4` = 100) and (`test`.`t1`.`key3` = 100)))
select key1,key2,key3,key4 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
key1 key2 key3 key4
100 100 100 100
100 100 -1 -1
-1 -1 100 100
explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 154 100.00 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1` from `test`.`t1` where (((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100)) or ((`test`.`t1`.`key4` = 100) and (`test`.`t1`.`key3` = 100)))
select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
key1 key2 key3 key4 filler1
100 100 100 100 key1-key2-key3-key4
100 100 -1 -1 key1-key2
-1 -1 100 100 key4-key3
# 3-way ROR-intersection
explain select key1,key2,key3 from t1 where key1=100 and key2=100 and key3=100;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2,key3 key1,key2,key3 5,5,5 NULL 2 100.00 Using intersect(key1,key2,key3); Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3` from `test`.`t1` where ((`test`.`t1`.`key3` = 100) and (`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100))
select key1,key2,key3 from t1 where key1=100 and key2=100 and key3=100;
key1 key2 key3
100 100 100
# ROR-union(ROR-intersection, ROR-range)
insert into t1 (key1,key2,key3,key4,filler1) values (101,101,101,101, 'key1234-101');
explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=101;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2,key3 key1,key2,key3 5,5,5 NULL 83 100.00 Using union(intersect(key1,key2),key3); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1` from `test`.`t1` where (((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100)) or (`test`.`t1`.`key3` = 101))
select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=101;
key1 key2 key3 key4 filler1
100 100 100 100 key1-key2-key3-key4
100 100 -1 -1 key1-key2
101 101 101 101 key1234-101
# Run some ROR updates/deletes
select key1,key2, filler1 from t1 where key1=100 and key2=100;
key1 key2 filler1
100 100 key1-key2-key3-key4
100 100 key1-key2
update t1 set filler1='to be deleted' where key1=100 and key2=100;
update t1 set key1=200,key2=200 where key1=100 and key2=100;
delete from t1 where key1=200 and key2=200;
select key1,key2,filler1 from t1 where key2=100 and key2=200;
key1 key2 filler1
# ROR-union(ROR-intersection) with one of ROR-intersection giving empty
# results
explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 152 100.00 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1` from `test`.`t1` where (((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100)) or ((`test`.`t1`.`key4` = 100) and (`test`.`t1`.`key3` = 100)))
select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
key1 key2 key3 key4 filler1
-1 -1 100 100 key4-key3
delete from t1 where key3=100 and key4=100;
# ROR-union with all ROR-intersections giving empty results
explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 152 100.00 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1` from `test`.`t1` where (((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100)) or ((`test`.`t1`.`key4` = 100) and (`test`.`t1`.`key3` = 100)))
select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
key1 key2 key3 key4 filler1
# ROR-intersection with empty result
explain select key1,key2 from t1 where key1=100 and key2=100;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2 key1,key2 5,5 NULL 76 100.00 Using intersect(key1,key2); Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2` from `test`.`t1` where ((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100))
select key1,key2 from t1 where key1=100 and key2=100;
key1 key2
# ROR-union tests with various cases.
# All scans returning duplicate rows:
insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-1');
insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-2');
insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-3');
explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 136 100.00 Using union(key3,intersect(key1,key2),key4); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1` from `test`.`t1` where ((`test`.`t1`.`key3` = 200) or ((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100)) or (`test`.`t1`.`key4` = 200))
select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
key1 key2 key3 key4 filler1
100 100 200 200 key1-key2-key3-key4-3
100 100 200 200 key1-key2-key3-key4-2
100 100 200 200 key1-key2-key3-key4-1
insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, -1, 200,'key4');
explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 146 100.00 Using union(key3,intersect(key1,key2),key4); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1` from `test`.`t1` where ((`test`.`t1`.`key3` = 200) or ((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100)) or (`test`.`t1`.`key4` = 200))
select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
key1 key2 key3 key4 filler1
100 100 200 200 key1-key2-key3-key4-3
100 100 200 200 key1-key2-key3-key4-2
100 100 200 200 key1-key2-key3-key4-1
-1 -1 -1 200 key4
insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, 200, -1,'key3');
explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 156 100.00 Using union(key3,intersect(key1,key2),key4); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1` from `test`.`t1` where ((`test`.`t1`.`key3` = 200) or ((`test`.`t1`.`key2` = 100) and (`test`.`t1`.`key1` = 100)) or (`test`.`t1`.`key4` = 200))
select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
key1 key2 key3 key4 filler1
100 100 200 200 key1-key2-key3-key4-3
100 100 200 200 key1-key2-key3-key4-2
100 100 200 200 key1-key2-key3-key4-1
-1 -1 -1 200 key4
-1 -1 200 -1 key3
##
## Optimizer tests
##
# Check that the shortest key is used for ROR-intersection, covering and non-covering.
explain select * from t1 where st_a=1 and st_b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b st_a,st_b 4,4 NULL 3515 100.00 Using intersect(st_a,st_b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2`,`test`.`t1`.`filler3` AS `filler3`,`test`.`t1`.`filler4` AS `filler4`,`test`.`t1`.`filler5` AS `filler5`,`test`.`t1`.`filler6` AS `filler6` from `test`.`t1` where ((`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`st_a` = 1))
explain select st_a,st_b from t1 where st_a=1 and st_b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b st_a,st_b 4,4 NULL 3515 100.00 Using intersect(st_a,st_b); Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`st_b` AS `st_b` from `test`.`t1` where ((`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`st_a` = 1))
explain select st_a from t1 ignore index (st_a) where st_a=1 and st_b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,stb_swt1a_2b,stb_swt1b,st_b st_b 4 const 15093 24.02 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a` from `test`.`t1` IGNORE INDEX (`st_a`) where ((`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`st_a` = 1))
# Do many tests
# Check that keys that don't improve selectivity are skipped.
explain select * from t1 where st_a=1 and swt1a=1 and swt2a=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a sta_swt21a 12 const,const,const 971 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2`,`test`.`t1`.`filler3` AS `filler3`,`test`.`t1`.`filler4` AS `filler4`,`test`.`t1`.`filler5` AS `filler5`,`test`.`t1`.`filler6` AS `filler6` from `test`.`t1` where ((`test`.`t1`.`swt2a` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1))
explain select * from t1 where st_b=1 and swt1b=1 and swt2b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref stb_swt1a_2b,stb_swt1b,st_b stb_swt1a_2b 8 const,const 3879 10.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2`,`test`.`t1`.`filler3` AS `filler3`,`test`.`t1`.`filler4` AS `filler4`,`test`.`t1`.`filler5` AS `filler5`,`test`.`t1`.`filler6` AS `filler6` from `test`.`t1` where ((`test`.`t1`.`swt2b` = 1) and (`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1))
explain select * from t1 where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a,stb_swt1a_2b 12,12 NULL 58 10.00 Using intersect(sta_swt12a,stb_swt1a_2b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2`,`test`.`t1`.`filler3` AS `filler3`,`test`.`t1`.`filler4` AS `filler4`,`test`.`t1`.`filler5` AS `filler5`,`test`.`t1`.`filler6` AS `filler6` from `test`.`t1` where ((`test`.`t1`.`swt2b` = 1) and (`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt2a` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1))
explain select * from t1 ignore index (sta_swt21a, stb_swt1a_2b)
where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge sta_swt12a,sta_swt1a,sta_swt2a,st_a,stb_swt1b,st_b sta_swt12a,stb_swt1b 12,8 NULL 58 10.00 Using intersect(sta_swt12a,stb_swt1b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2`,`test`.`t1`.`filler3` AS `filler3`,`test`.`t1`.`filler4` AS `filler4`,`test`.`t1`.`filler5` AS `filler5`,`test`.`t1`.`filler6` AS `filler6` from `test`.`t1` IGNORE INDEX (`stb_swt1a_2b`) IGNORE INDEX (`sta_swt21a`) where ((`test`.`t1`.`swt2b` = 1) and (`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt2a` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1))
explain select * from t1 ignore index (sta_swt21a, sta_swt12a, stb_swt1a_2b)
where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge sta_swt1a,sta_swt2a,st_a,stb_swt1b,st_b sta_swt1a,stb_swt1b,sta_swt2a 8,8,8 NULL 57 10.00 Using intersect(sta_swt1a,stb_swt1b,sta_swt2a); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2`,`test`.`t1`.`filler3` AS `filler3`,`test`.`t1`.`filler4` AS `filler4`,`test`.`t1`.`filler5` AS `filler5`,`test`.`t1`.`filler6` AS `filler6` from `test`.`t1` IGNORE INDEX (`stb_swt1a_2b`) IGNORE INDEX (`sta_swt12a`) IGNORE INDEX (`sta_swt21a`) where ((`test`.`t1`.`swt2b` = 1) and (`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt2a` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1))
explain select * from t1 ignore index (sta_swt21a, sta_swt12a, stb_swt1a_2b, stb_swt1b)
where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge sta_swt1a,sta_swt2a,st_a,st_b sta_swt1a,sta_swt2a,st_b 8,8,4 NULL 223 1.00 Using intersect(sta_swt1a,sta_swt2a,st_b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2`,`test`.`t1`.`filler3` AS `filler3`,`test`.`t1`.`filler4` AS `filler4`,`test`.`t1`.`filler5` AS `filler5`,`test`.`t1`.`filler6` AS `filler6` from `test`.`t1` IGNORE INDEX (`stb_swt1b`) IGNORE INDEX (`stb_swt1a_2b`) IGNORE INDEX (`sta_swt12a`) IGNORE INDEX (`sta_swt21a`) where ((`test`.`t1`.`swt2b` = 1) and (`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt2a` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1))
explain select * from t1
where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a,stb_swt1a_2b 12,12 NULL 58 100.00 Using intersect(sta_swt12a,stb_swt1a_2b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2`,`test`.`t1`.`filler3` AS `filler3`,`test`.`t1`.`filler4` AS `filler4`,`test`.`t1`.`filler5` AS `filler5`,`test`.`t1`.`filler6` AS `filler6` from `test`.`t1` where ((`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt2a` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1))
explain select * from t1
where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 232 100.00 Using intersect(sta_swt1a,stb_swt1b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3`,`test`.`t1`.`key4` AS `key4`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2`,`test`.`t1`.`filler3` AS `filler3`,`test`.`t1`.`filler4` AS `filler4`,`test`.`t1`.`filler5` AS `filler5`,`test`.`t1`.`filler6` AS `filler6` from `test`.`t1` where ((`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1))
explain select st_a from t1
where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 232 100.00 Using intersect(sta_swt1a,stb_swt1b); Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a` from `test`.`t1` where ((`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1))
explain select st_a from t1
where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 232 100.00 Using intersect(sta_swt1a,stb_swt1b); Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a` from `test`.`t1` where ((`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1))
drop table t0,t1;
# 'Partially' covered fields test
create table t2 (
a char(10),
b char(10),
filler1 char(255),
filler2 char(255),
key(a(5)),
key(b(5))
);
select count(a) from t2 where a='BBBBBBBB';
count(a)
4
select count(a) from t2 where b='BBBBBBBB';
count(a)
4
# BUG#1:
expla_or_bin select count(a_or_b) from t2 where a_or_b='AAAAAAAA' a_or_bnd a_or_b='AAAAAAAA';
id select_type ta_or_ba_or_ble pa_or_brtitions type possia_or_ble_keys key key_len ref rows filtered Extra_or_b
1 SIMPLE t2 NULL ref a_or_b,a_or_b a_or_b 6 const 4 12.50 Using where
Warnings:
Note 1003 /* select#1 */ select count(`test`.`t2`.`a_or_b`) AS `count(a_or_b)` from `test`.`t2` where ((`test`.`t2`.`a_or_b` = 'AAAAAAAA') a_or_bnd (`test`.`t2`.`a_or_b` = 'AAAAAAAA'))
select count(a) from t2 where a='AAAAAAAA' and b='AAAAAAAA';
count(a)
4
select count(a) from t2 ignore index(a,b) where a='AAAAAAAA' and b='AAAAAAAA';
count(a)
4
insert into t2 values ('ab', 'ab', 'uh', 'oh');
explain select a from t2 where a='ab';
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 NULL ref a a 6 const 1 100.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a` from `test`.`t2` where (`test`.`t2`.`a` = 'ab')
drop table t2;
#
# BUG#25048 - ERROR 126 : Incorrect key file for table '.XXXX.MYI';
# try to repair it
#
CREATE TABLE t1(c1 INT, c2 INT DEFAULT 0, c3 CHAR(255) DEFAULT '',
KEY(c1), KEY(c2), KEY(c3));
INSERT INTO t1(c1) VALUES(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),
(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0);
INSERT INTO t1 VALUES(0,0,0);
CREATE TABLE t2(c1 int);
INSERT INTO t2 VALUES(1);
DELETE t1 FROM t1,t2 WHERE t1.c1=0 AND t1.c2=0;
SELECT * FROM t1;
c1 c2 c3
DROP TABLE t1,t2;
#---------------- Index merge test 2 -------------------------------------------
# (Start of test file: index_merge2.inc)
SET SESSION DEFAULT_STORAGE_ENGINE = MyISAM;
drop table if exists t1,t2;
create table t1
(
key1 int not null,
key2 int not null,
INDEX i1(key1),
INDEX i2(key2)
);
# No primary key
explain select * from t1 where key1 < 5 or key2 > 197;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge i1,i2 i1,i2 4,4 NULL 10 100.00 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2` from `test`.`t1` where ((`test`.`t1`.`key1` < 5) or (`test`.`t1`.`key2` > 197))
select * from t1 where key1 < 5 or key2 > 197;
key1 key2
0 200
1 199
2 198
3 197
4 196
explain select * from t1 where key1 < 3 or key2 > 195;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge i1,i2 i1,i2 4,4 NULL 10 100.00 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2` from `test`.`t1` where ((`test`.`t1`.`key1` < 3) or (`test`.`t1`.`key2` > 195))
select * from t1 where key1 < 3 or key2 > 195;
key1 key2
0 200
1 199
2 198
3 197
4 196
# Primary key as case-sensitive string with \0s.
# also make primary key be longer then max. index length of MyISAM.
alter table t1 add str1 char (255) not null,
add zeroval int not null default 0,
add str2 char (255) not null,
add str3 char (255) not null;
update t1 set str1='aaa', str2='bbb', str3=concat(key2, '-', key1 div 2, '_' ,if(key1 mod 2 = 0, 'a', 'A'));
alter table t1 add primary key (str1, zeroval, str2, str3);
explain select * from t1 where key1 < 5 or key2 > 197;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge i1,i2 i1,i2 4,4 NULL 10 100.00 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`str1` AS `str1`,`test`.`t1`.`zeroval` AS `zeroval`,`test`.`t1`.`str2` AS `str2`,`test`.`t1`.`str3` AS `str3` from `test`.`t1` where ((`test`.`t1`.`key1` < 5) or (`test`.`t1`.`key2` > 197))
select * from t1 where key1 < 5 or key2 > 197;
key1 key2 str1 zeroval str2 str3
0 200 aaa 0 bbb 200-0_a
1 199 aaa 0 bbb 199-0_A
2 198 aaa 0 bbb 198-1_a
3 197 aaa 0 bbb 197-1_A
4 196 aaa 0 bbb 196-2_a
explain select * from t1 where key1 < 3 or key2 > 195;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge i1,i2 i1,i2 4,4 NULL 10 100.00 Using sort_union(i1,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`str1` AS `str1`,`test`.`t1`.`zeroval` AS `zeroval`,`test`.`t1`.`str2` AS `str2`,`test`.`t1`.`str3` AS `str3` from `test`.`t1` where ((`test`.`t1`.`key1` < 3) or (`test`.`t1`.`key2` > 195))
select * from t1 where key1 < 3 or key2 > 195;
key1 key2 str1 zeroval str2 str3
0 200 aaa 0 bbb 200-0_a
1 199 aaa 0 bbb 199-0_A
2 198 aaa 0 bbb 198-1_a
3 197 aaa 0 bbb 197-1_A
4 196 aaa 0 bbb 196-2_a
# Test for BUG#5401
drop table t1;
create table t1 (
pk integer not null auto_increment primary key,
key1 integer,
key2 integer not null,
filler char (200),
index (key1),
index (key2)
);
show warnings;
Level Code Message
explain select pk from t1 where key1 = 1 and key2 = 1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref key1,key2 key1 5 const 4 26.67 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`pk` AS `pk` from `test`.`t1` where ((`test`.`t1`.`key2` = 1) and (`test`.`t1`.`key1` = 1))
select pk from t1 where key2 = 1 and key1 = 1;
pk
26
27
select pk from t1 ignore index(key1,key2) where key2 = 1 and key1 = 1;
pk
26
27
# More tests for BUG#5401.
drop table t1;
create table t1 (
pk int primary key auto_increment,
key1a int,
key2a int,
key1b int,
key2b int,
dummy1 int,
dummy2 int,
dummy3 int,
dummy4 int,
key3a int,
key3b int,
filler1 char (200),
index i1(key1a, key1b),
index i2(key2a, key2b),
index i3(key3a, key3b)
);
create table t2 (a int);
insert into t2 values (0),(1),(2),(3),(4),(NULL);
insert into t1 (key1a, key1b, key2a, key2b, key3a, key3b)
select A.a, B.a, C.a, D.a, C.a, D.a from t2 A,t2 B,t2 C, t2 D;
insert into t1 (key1a, key1b, key2a, key2b, key3a, key3b)
select key1a, key1b, key2a, key2b, key3a, key3b from t1;
insert into t1 (key1a, key1b, key2a, key2b, key3a, key3b)
select key1a, key1b, key2a, key2b, key3a, key3b from t1;
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
select count(*) from t1;
count(*)
5184
explain select count(*) from t1 where
key1a = 2 and key1b is null and key2a = 2 and key2b is null;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge i1,i2 i1,i2 10,10 NULL 2 100.00 Using intersect(i1,i2); Using where; Using index
Warnings:
Note 1003 /* select#1 */ select count(0) AS `count(*)` from `test`.`t1` where ((`test`.`t1`.`key2a` = 2) and (`test`.`t1`.`key1a` = 2) and isnull(`test`.`t1`.`key1b`) and isnull(`test`.`t1`.`key2b`))
select count(*) from t1 where
key1a = 2 and key1b is null and key2a = 2 and key2b is null;
count(*)
4
explain select count(*) from t1 where
key1a = 2 and key1b is null and key3a = 2 and key3b is null;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge i1,i3 i1,i3 10,10 NULL 2 100.00 Using intersect(i1,i3); Using where; Using index
Warnings:
Note 1003 /* select#1 */ select count(0) AS `count(*)` from `test`.`t1` where ((`test`.`t1`.`key3a` = 2) and (`test`.`t1`.`key1a` = 2) and isnull(`test`.`t1`.`key1b`) and isnull(`test`.`t1`.`key3b`))
select count(*) from t1 where
key1a = 2 and key1b is null and key3a = 2 and key3b is null;
count(*)
4
drop table t1,t2;
# Test for BUG#8441
create table t1 (
id1 int,
id2 date ,
index idx2 (id1,id2),
index idx1 (id2)
);
insert into t1 values(1,'20040101'), (2,'20040102');
select * from t1 where id1 = 1 and id2= '20040101';
id1 id2
1 2004-01-01
drop table t1;
# Test for BUG#12720
drop view if exists v1;
CREATE TABLE t1 (
`oid` int(11) unsigned NOT NULL auto_increment,
`fk_bbk_niederlassung` int(11) unsigned NOT NULL,
`fk_wochentag` int(11) unsigned NOT NULL,
`uhrzeit_von` time NOT NULL COMMENT 'HH:MM',
`uhrzeit_bis` time NOT NULL COMMENT 'HH:MM',
`geloescht` tinyint(4) NOT NULL,
`version` int(5) NOT NULL,
PRIMARY KEY (`oid`),
KEY `fk_bbk_niederlassung` (`fk_bbk_niederlassung`),
KEY `fk_wochentag` (`fk_wochentag`),
KEY `ix_version` (`version`)
) DEFAULT CHARSET=latin1;
insert into t1 values
(1, 38, 1, '08:00:00', '13:00:00', 0, 1),
(2, 38, 2, '08:00:00', '13:00:00', 0, 1),
(3, 38, 3, '08:00:00', '13:00:00', 0, 1),
(4, 38, 4, '08:00:00', '13:00:00', 0, 1),
(5, 38, 5, '08:00:00', '13:00:00', 0, 1),
(6, 38, 5, '08:00:00', '13:00:00', 1, 2),
(7, 38, 3, '08:00:00', '13:00:00', 1, 2),
(8, 38, 1, '08:00:00', '13:00:00', 1, 2),
(9, 38, 2, '08:00:00', '13:00:00', 1, 2),
(10, 38, 4, '08:00:00', '13:00:00', 1, 2),
(11, 38, 1, '08:00:00', '13:00:00', 0, 3),
(12, 38, 2, '08:00:00', '13:00:00', 0, 3),
(13, 38, 3, '08:00:00', '13:00:00', 0, 3),
(14, 38, 4, '08:00:00', '13:00:00', 0, 3),
(15, 38, 5, '08:00:00', '13:00:00', 0, 3),
(16, 38, 4, '08:00:00', '13:00:00', 0, 4),
(17, 38, 5, '08:00:00', '13:00:00', 0, 4),
(18, 38, 1, '08:00:00', '13:00:00', 0, 4),
(19, 38, 2, '08:00:00', '13:00:00', 0, 4),
(20, 38, 3, '08:00:00', '13:00:00', 0, 4),
(21, 7, 1, '08:00:00', '13:00:00', 0, 1),
(22, 7, 2, '08:00:00', '13:00:00', 0, 1),
(23, 7, 3, '08:00:00', '13:00:00', 0, 1),
(24, 7, 4, '08:00:00', '13:00:00', 0, 1),
(25, 7, 5, '08:00:00', '13:00:00', 0, 1);
create view v1 as
select
zeit1.oid AS oid,
zeit1.fk_bbk_niederlassung AS fk_bbk_niederlassung,
zeit1.fk_wochentag AS fk_wochentag,
zeit1.uhrzeit_von AS uhrzeit_von,
zeit1.uhrzeit_bis AS uhrzeit_bis,
zeit1.geloescht AS geloescht,
zeit1.version AS version
from
t1 zeit1
where
(zeit1.version =
(select max(zeit2.version) AS `max(version)`
from t1 zeit2
where
((zeit1.fk_bbk_niederlassung = zeit2.fk_bbk_niederlassung) and
(zeit1.fk_wochentag = zeit2.fk_wochentag) and
(zeit1.uhrzeit_von = zeit2.uhrzeit_von) and
(zeit1.uhrzeit_bis = zeit2.uhrzeit_bis)
)
)
)
and (zeit1.geloescht = 0);
select * from v1 where oid = 21;
oid fk_bbk_niederlassung fk_wochentag uhrzeit_von uhrzeit_bis geloescht version
21 7 1 08:00:00 13:00:00 0 1
drop view v1;
drop table t1;
CREATE TABLE t1(
t_cpac varchar(2) NOT NULL,
t_vers varchar(4) NOT NULL,
t_rele varchar(2) NOT NULL,
t_cust varchar(4) NOT NULL,
filler1 char(250) default NULL,
filler2 char(250) default NULL,
PRIMARY KEY (t_cpac,t_vers,t_rele,t_cust),
UNIQUE KEY IX_4 (t_cust,t_cpac,t_vers,t_rele),
KEY IX_5 (t_vers,t_rele,t_cust)
);
insert into t1 values
('tm','2.5 ','a ',' ','',''), ('tm','2.5U','a ','stnd','',''),
('da','3.3 ','b ',' ','',''), ('da','3.3U','b ','stnd','',''),
('tl','7.6 ','a ',' ','',''), ('tt','7.6 ','a ',' ','',''),
('bc','B61 ','a ',' ','',''), ('bp','B61 ','a ',' ','',''),
('ca','B61 ','a ',' ','',''), ('ci','B61 ','a ',' ','',''),
('cp','B61 ','a ',' ','',''), ('dm','B61 ','a ',' ','',''),
('ec','B61 ','a ',' ','',''), ('ed','B61 ','a ',' ','',''),
('fm','B61 ','a ',' ','',''), ('nt','B61 ','a ',' ','',''),
('qm','B61 ','a ',' ','',''), ('tc','B61 ','a ',' ','',''),
('td','B61 ','a ',' ','',''), ('tf','B61 ','a ',' ','',''),
('tg','B61 ','a ',' ','',''), ('ti','B61 ','a ',' ','',''),
('tp','B61 ','a ',' ','',''), ('ts','B61 ','a ',' ','',''),
('wh','B61 ','a ',' ','',''), ('bc','B61U','a ','stnd','',''),
('bp','B61U','a ','stnd','',''), ('ca','B61U','a ','stnd','',''),
('ci','B61U','a ','stnd','',''), ('cp','B61U','a ','stnd','',''),
('dm','B61U','a ','stnd','',''), ('ec','B61U','a ','stnd','',''),
('fm','B61U','a ','stnd','',''), ('nt','B61U','a ','stnd','',''),
('qm','B61U','a ','stnd','',''), ('tc','B61U','a ','stnd','',''),
('td','B61U','a ','stnd','',''), ('tf','B61U','a ','stnd','',''),
('tg','B61U','a ','stnd','',''), ('ti','B61U','a ','stnd','',''),
('tp','B61U','a ','stnd','',''), ('ts','B61U','a ','stnd','',''),
('wh','B61U','a ','stnd','','');
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`t_cpac` varchar(2) NOT NULL,
`t_vers` varchar(4) NOT NULL,
`t_rele` varchar(2) NOT NULL,
`t_cust` varchar(4) NOT NULL,
`filler1` char(250) DEFAULT NULL,
`filler2` char(250) DEFAULT NULL,
PRIMARY KEY (`t_cpac`,`t_vers`,`t_rele`,`t_cust`),
UNIQUE KEY `IX_4` (`t_cust`,`t_cpac`,`t_vers`,`t_rele`),
KEY `IX_5` (`t_vers`,`t_rele`,`t_cust`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
select t_vers,t_rele,t_cust,filler1 from t1 where t_vers = '7.6';
t_vers t_rele t_cust filler1
7.6 a
7.6 a
select t_vers,t_rele,t_cust,filler1 from t1 where t_vers = '7.6'
and t_rele='a' and t_cust = ' ';
t_vers t_rele t_cust filler1
7.6 a
7.6 a
drop table t1;
# BUG#19021: Crash in index_merge/ROR-intersection optimizer under
# specific circumstances.
create table t1 (
pk int(11) not null auto_increment,
a int(11) not null default '0',
b int(11) not null default '0',
c int(11) not null default '0',
filler1 datetime, filler2 varchar(15),
filler3 longtext,
kp1 varchar(4), kp2 varchar(7),
kp3 varchar(2), kp4 varchar(4),
kp5 varchar(7),
filler4 char(1),
primary key (pk),
key idx1(a,b,c),
key idx2(c),
key idx3(kp1,kp2,kp3,kp4,kp5)
) default charset=latin1;
set @fill=NULL;
SELECT COUNT(*) FROM t1 WHERE b = 0 AND a = 0 AND c = 13286427 AND
kp1='279' AND kp2='ELM0678' AND kp3='6' AND kp4='10' AND kp5 = 'R ';
COUNT(*)
1
drop table t1;
# BUG#21277: Index Merge/sort_union: wrong query results
create table t1
(
key1 int not null,
key2 int not null default 0,
key3 int not null default 0
);
insert into t1(key1) values (1),(2),(3),(4),(5),(6),(7),(8);
set @d=8;
insert into t1 (key1) select key1+@d from t1;
set @d=@d*2;
insert into t1 (key1) select key1+@d from t1;
set @d=@d*2;
insert into t1 (key1) select key1+@d from t1;
set @d=@d*2;
insert into t1 (key1) select key1+@d from t1;
set @d=@d*2;
insert into t1 (key1) select key1+@d from t1;
set @d=@d*2;
insert into t1 (key1) select key1+@d from t1;
set @d=@d*2;
insert into t1 (key1) select key1+@d from t1;
set @d=@d*2;
alter table t1 add index i2(key2);
alter table t1 add index i3(key3);
update t1 set key2=key1,key3=key1;
explain select * from t1 where (key3 > 30 and key3<35) or (key2 >32 and key2 < 40);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge i2,i3 i3,i2 4,4 NULL 11 100.00 Using sort_union(i3,i2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3` from `test`.`t1` where (((`test`.`t1`.`key3` > 30) and (`test`.`t1`.`key3` < 35)) or ((`test`.`t1`.`key2` > 32) and (`test`.`t1`.`key2` < 40)))
select * from t1 where (key3 > 30 and key3<35) or (key2 >32 and key2 < 40);
key1 key2 key3
31 31 31
32 32 32
33 33 33
34 34 34
35 35 35
36 36 36
37 37 37
38 38 38
39 39 39
drop table t1;
#
# Bug#56423: Different count with SELECT and CREATE SELECT queries
#
CREATE TABLE t1 (
a INT,
b INT,
c INT,
d INT,
PRIMARY KEY (a),
KEY (c),
KEY bd (b,d)
);
INSERT INTO t1 VALUES
(1, 0, 1, 0),
(2, 1, 1, 1),
(3, 1, 1, 1),
(4, 0, 1, 1);
EXPLAIN
SELECT a
FROM t1
WHERE c = 1 AND b = 1 AND d = 1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref c,bd bd 10 const,const 2 75.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`d` = 1) and (`test`.`t1`.`b` = 1) and (`test`.`t1`.`c` = 1))
CREATE TABLE t2 ( a INT )
SELECT a
FROM t1
WHERE c = 1 AND b = 1 AND d = 1;
SELECT * FROM t2;
a
2
3
DROP TABLE t1, t2;
CREATE TABLE t1( a INT, b INT, KEY(a), KEY(b) );
INSERT INTO t1 VALUES (1, 2), (1, 2), (1, 2), (1, 2);
SELECT * FROM t1 FORCE INDEX(a, b) WHERE a = 1 AND b = 2;
a b
1 2
1 2
1 2
1 2
DROP TABLE t1;
# Code coverage of fix.
CREATE TABLE t1 ( a INT NOT NULL AUTO_INCREMENT PRIMARY KEY, b INT);
INSERT INTO t1 (b) VALUES (1);
UPDATE t1 SET b = 2 WHERE a = 1;
SELECT * FROM t1;
a b
1 2
CREATE TABLE t2 ( a INT NOT NULL AUTO_INCREMENT PRIMARY KEY, b VARCHAR(1) );
INSERT INTO t2 (b) VALUES ('a');
UPDATE t2 SET b = 'b' WHERE a = 1;
SELECT * FROM t2;
a b
1 b
DROP TABLE t1, t2;
#
# BUG#13970015: ASSERT `MIN_ENDP || MAX_ENDP' FAILED IN
# HANDLER::MULTI_RANGE_READ_INFO_CONST
#
CREATE TABLE t1 (
pk INT NOT NULL,
col_int_key INT NOT NULL,
col_varchar_key VARCHAR(1) NOT NULL,
PRIMARY KEY (pk),
KEY col_int_key (col_int_key),
KEY col_varchar_key (col_varchar_key,col_int_key)
);
INSERT INTO t1 VALUES (1,1,'a'), (2,2,'b');
EXPLAIN
SELECT col_int_key
FROM t1
WHERE col_varchar_key >= 'l' OR
(((pk BETWEEN 141 AND 141) OR col_varchar_key <> 'l')
AND ((pk BETWEEN 141 AND 141) OR (col_int_key > 141)));
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ALL PRIMARY,col_int_key,col_varchar_key NULL NULL NULL 2 78.12 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`col_int_key` AS `col_int_key` from `test`.`t1` where ((`test`.`t1`.`col_varchar_key` >= 'l') or (((`test`.`t1`.`pk` between 141 and 141) or (`test`.`t1`.`col_varchar_key` <> 'l')) and ((`test`.`t1`.`pk` between 141 and 141) or (`test`.`t1`.`col_int_key` > 141))))
SELECT col_int_key
FROM t1
WHERE col_varchar_key >= 'l' OR
(((pk BETWEEN 141 AND 141) OR col_varchar_key <> 'l')
AND ((pk BETWEEN 141 AND 141) OR (col_int_key > 141)));
col_int_key
DROP TABLE t1;
#---------------- 2-sweeps read Index merge test 2 -------------------------------
# (Start of test file: index_merge_2sweeps.inc)
SET SESSION DEFAULT_STORAGE_ENGINE = MyISAM;
drop table if exists t1;
create table t1 (
pk int primary key,
key1 int,
key2 int,
filler char(200),
filler2 char(200),
index(key1),
index(key2)
);
select * from t1 where (key1 >= 2 and key1 <= 10) or (pk >= 4 and pk <=8 );
pk key1 key2 filler filler2
10 10 10 filler-data filler-data-2
9 9 9 filler-data filler-data-2
8 8 8 filler-data filler-data-2
7 7 7 filler-data filler-data-2
6 6 6 filler-data filler-data-2
5 5 5 filler-data filler-data-2
4 4 4 filler-data filler-data-2
3 3 3 filler-data filler-data-2
2 2 2 filler-data filler-data-2
set @maxv=1000;
select * from t1 where
(pk < 5) or (pk > 10 and pk < 15) or (pk >= 50 and pk < 55 ) or (pk > @maxv-10)
or key1=18 or key1=60;
pk key1 key2 filler filler2
1000 1000 1000 filler-data filler-data-2
999 999 999 filler-data filler-data-2
998 998 998 filler-data filler-data-2
997 997 997 filler-data filler-data-2
996 996 996 filler-data filler-data-2
995 995 995 filler-data filler-data-2
994 994 994 filler-data filler-data-2
993 993 993 filler-data filler-data-2
992 992 992 filler-data filler-data-2
991 991 991 filler-data filler-data-2
60 60 60 filler-data filler-data-2
54 54 54 filler-data filler-data-2
53 53 53 filler-data filler-data-2
52 52 52 filler-data filler-data-2
51 51 51 filler-data filler-data-2
50 50 50 filler-data filler-data-2
18 18 18 filler-data filler-data-2
14 14 14 filler-data filler-data-2
13 13 13 filler-data filler-data-2
12 12 12 filler-data filler-data-2
11 11 11 filler-data filler-data-2
4 4 4 filler-data filler-data-2
3 3 3 filler-data filler-data-2
2 2 2 filler-data filler-data-2
1 1 1 filler-data filler-data-2
select * from t1 where
(pk < 5) or (pk > 10 and pk < 15) or (pk >= 50 and pk < 55 ) or (pk > @maxv-10)
or key1 < 3 or key1 > @maxv-11;
pk key1 key2 filler filler2
1000 1000 1000 filler-data filler-data-2
999 999 999 filler-data filler-data-2
998 998 998 filler-data filler-data-2
997 997 997 filler-data filler-data-2
996 996 996 filler-data filler-data-2
995 995 995 filler-data filler-data-2
994 994 994 filler-data filler-data-2
993 993 993 filler-data filler-data-2
992 992 992 filler-data filler-data-2
991 991 991 filler-data filler-data-2
990 990 990 filler-data filler-data-2
54 54 54 filler-data filler-data-2
53 53 53 filler-data filler-data-2
52 52 52 filler-data filler-data-2
51 51 51 filler-data filler-data-2
50 50 50 filler-data filler-data-2
14 14 14 filler-data filler-data-2
13 13 13 filler-data filler-data-2
12 12 12 filler-data filler-data-2
11 11 11 filler-data filler-data-2
4 4 4 filler-data filler-data-2
3 3 3 filler-data filler-data-2
2 2 2 filler-data filler-data-2
1 1 1 filler-data filler-data-2
select * from t1 where
(pk < 5) or (pk > 10 and pk < 15) or (pk >= 50 and pk < 55 ) or (pk > @maxv-10)
or
(key1 < 5) or (key1 > 10 and key1 < 15) or (key1 >= 50 and key1 < 55 ) or (key1 > @maxv-10);
pk key1 key2 filler filler2
1000 1000 1000 filler-data filler-data-2
999 999 999 filler-data filler-data-2
998 998 998 filler-data filler-data-2
997 997 997 filler-data filler-data-2
996 996 996 filler-data filler-data-2
995 995 995 filler-data filler-data-2
994 994 994 filler-data filler-data-2
993 993 993 filler-data filler-data-2
992 992 992 filler-data filler-data-2
991 991 991 filler-data filler-data-2
54 54 54 filler-data filler-data-2
53 53 53 filler-data filler-data-2
52 52 52 filler-data filler-data-2
51 51 51 filler-data filler-data-2
50 50 50 filler-data filler-data-2
14 14 14 filler-data filler-data-2
13 13 13 filler-data filler-data-2
12 12 12 filler-data filler-data-2
11 11 11 filler-data filler-data-2
4 4 4 filler-data filler-data-2
3 3 3 filler-data filler-data-2
2 2 2 filler-data filler-data-2
1 1 1 filler-data filler-data-2
select * from t1 where
(pk > 10 and pk < 15) or (pk >= 50 and pk < 55 )
or
(key1 < 5) or (key1 > @maxv-10);
pk key1 key2 filler filler2
1000 1000 1000 filler-data filler-data-2
999 999 999 filler-data filler-data-2
998 998 998 filler-data filler-data-2
997 997 997 filler-data filler-data-2
996 996 996 filler-data filler-data-2
995 995 995 filler-data filler-data-2
994 994 994 filler-data filler-data-2
993 993 993 filler-data filler-data-2
992 992 992 filler-data filler-data-2
991 991 991 filler-data filler-data-2
54 54 54 filler-data filler-data-2
53 53 53 filler-data filler-data-2
52 52 52 filler-data filler-data-2
51 51 51 filler-data filler-data-2
50 50 50 filler-data filler-data-2
14 14 14 filler-data filler-data-2
13 13 13 filler-data filler-data-2
12 12 12 filler-data filler-data-2
11 11 11 filler-data filler-data-2
4 4 4 filler-data filler-data-2
3 3 3 filler-data filler-data-2
2 2 2 filler-data filler-data-2
1 1 1 filler-data filler-data-2
drop table t1;
#---------------- Clustered PK ROR-index_merge tests -----------------------------
# (Start of test file: index_merge_ror_cpk.inc)
SET SESSION DEFAULT_STORAGE_ENGINE = MyISAM;
drop table if exists t1;
create table t1
(
pk1 int not null,
pk2 int not null,
key1 int not null,
key2 int not null,
pktail1ok int not null,
pktail2ok int not null,
pktail3bad int not null,
pktail4bad int not null,
pktail5bad int not null,
pk2copy int not null,
badkey int not null,
filler1 char (200),
filler2 char (200),
key (key1),
key (key2),
/* keys with tails from CPK members */
key (pktail1ok, pk1),
key (pktail2ok, pk1, pk2),
key (pktail3bad, pk2, pk1),
key (pktail4bad, pk1, pk2copy),
key (pktail5bad, pk1, pk2, pk2copy),
primary key (pk1, pk2)
);
# Verify that range scan on CPK is ROR
# (use index_intersection because it is impossible to check that for index union)
# Column 9, rows, can change depending on innodb-page-size.
explain select * from t1 where pk1 = 1 and pk2 < 80 and key1=0;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range PRIMARY,key1 PRIMARY 8 NULL ROWS # Using index condition; Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`pk1` AS `pk1`,`test`.`t1`.`pk2` AS `pk2`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`pktail1ok` AS `pktail1ok`,`test`.`t1`.`pktail2ok` AS `pktail2ok`,`test`.`t1`.`pktail3bad` AS `pktail3bad`,`test`.`t1`.`pktail4bad` AS `pktail4bad`,`test`.`t1`.`pktail5bad` AS `pktail5bad`,`test`.`t1`.`pk2copy` AS `pk2copy`,`test`.`t1`.`badkey` AS `badkey`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`key1` = 0) and (`test`.`t1`.`pk1` = 1) and (`test`.`t1`.`pk2` < 80))
# CPK scan + 1 ROR range scan is a special case
select * from t1 where pk1 = 1 and pk2 < 80 and key1=0;
pk1 pk2 key1 key2 pktail1ok pktail2ok pktail3bad pktail4bad pktail5bad pk2copy badkey filler1 filler2
1 10 0 0 0 0 0 0 0 10 0 filler-data-10 filler2
1 11 0 0 0 0 0 0 0 11 0 filler-data-11 filler2
1 12 0 0 0 0 0 0 0 12 0 filler-data-12 filler2
1 13 0 0 0 0 0 0 0 13 0 filler-data-13 filler2
1 14 0 0 0 0 0 0 0 14 0 filler-data-14 filler2
1 15 0 0 0 0 0 0 0 15 0 filler-data-15 filler2
1 16 0 0 0 0 0 0 0 16 0 filler-data-16 filler2
1 17 0 0 0 0 0 0 0 17 0 filler-data-17 filler2
1 18 0 0 0 0 0 0 0 18 0 filler-data-18 filler2
1 19 0 0 0 0 0 0 0 19 0 filler-data-19 filler2
# Verify that CPK fields are considered to be covered by index scans
explain select pk1,pk2 from t1 where key1 = 10 and key2=10 and 2*pk1+1 < 2*96+1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2 key1,key2 4,4 NULL 1 100.00 Using intersect(key1,key2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`pk1` AS `pk1`,`test`.`t1`.`pk2` AS `pk2` from `test`.`t1` where ((`test`.`t1`.`key2` = 10) and (`test`.`t1`.`key1` = 10) and (((2 * `test`.`t1`.`pk1`) + 1) < <cache>(((2 * 96) + 1))))
select pk1,pk2 from t1 where key1 = 10 and key2=10 and 2*pk1+1 < 2*96+1;
pk1 pk2
95 59
95 58
95 57
95 56
95 55
95 54
95 53
95 52
95 51
95 50
# Verify that CPK is always used for index intersection scans
# (this is because it is used as a filter, not for retrieval)
# The expected number of rows can vary depending on page size
explain select * from t1 where badkey=1 and key1=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref key1 key1 4 const ROWS 10.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`pk1` AS `pk1`,`test`.`t1`.`pk2` AS `pk2`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`pktail1ok` AS `pktail1ok`,`test`.`t1`.`pktail2ok` AS `pktail2ok`,`test`.`t1`.`pktail3bad` AS `pktail3bad`,`test`.`t1`.`pktail4bad` AS `pktail4bad`,`test`.`t1`.`pktail5bad` AS `pktail5bad`,`test`.`t1`.`pk2copy` AS `pk2copy`,`test`.`t1`.`badkey` AS `badkey`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`key1` = 10) and (`test`.`t1`.`badkey` = 1))
# The expected number of rows can vary depending on page size
explain select * from t1 where pk1 < 7500 and key1 = 10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref PRIMARY,key1 key1 4 const ROWS 99.99 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`pk1` AS `pk1`,`test`.`t1`.`pk2` AS `pk2`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`pktail1ok` AS `pktail1ok`,`test`.`t1`.`pktail2ok` AS `pktail2ok`,`test`.`t1`.`pktail3bad` AS `pktail3bad`,`test`.`t1`.`pktail4bad` AS `pktail4bad`,`test`.`t1`.`pktail5bad` AS `pktail5bad`,`test`.`t1`.`pk2copy` AS `pk2copy`,`test`.`t1`.`badkey` AS `badkey`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`key1` = 10) and (`test`.`t1`.`pk1` < 7500))
# Verify that keys with 'tails' of PK members are ok.
explain select * from t1 where pktail1ok=1 and key1=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref key1,pktail1ok pktail1ok 4 const 76 0.91 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`pk1` AS `pk1`,`test`.`t1`.`pk2` AS `pk2`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`pktail1ok` AS `pktail1ok`,`test`.`t1`.`pktail2ok` AS `pktail2ok`,`test`.`t1`.`pktail3bad` AS `pktail3bad`,`test`.`t1`.`pktail4bad` AS `pktail4bad`,`test`.`t1`.`pktail5bad` AS `pktail5bad`,`test`.`t1`.`pk2copy` AS `pk2copy`,`test`.`t1`.`badkey` AS `badkey`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`key1` = 10) and (`test`.`t1`.`pktail1ok` = 1))
explain select * from t1 where pktail2ok=1 and key1=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref key1,pktail2ok pktail2ok 4 const 82 0.91 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`pk1` AS `pk1`,`test`.`t1`.`pk2` AS `pk2`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`pktail1ok` AS `pktail1ok`,`test`.`t1`.`pktail2ok` AS `pktail2ok`,`test`.`t1`.`pktail3bad` AS `pktail3bad`,`test`.`t1`.`pktail4bad` AS `pktail4bad`,`test`.`t1`.`pktail5bad` AS `pktail5bad`,`test`.`t1`.`pk2copy` AS `pk2copy`,`test`.`t1`.`badkey` AS `badkey`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`key1` = 10) and (`test`.`t1`.`pktail2ok` = 1))
# Note: The following is actually a deficiency, it uses sort_union currently.
# This comment refers to InnoDB and is probably not valid for other engines.
explain select * from t1 where (pktail2ok=1 and pk1< 50000) or key1=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge PRIMARY,key1,pktail2ok pktail2ok,key1 8,4 NULL ROWS 100.00 Using sort_union(pktail2ok,key1); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`pk1` AS `pk1`,`test`.`t1`.`pk2` AS `pk2`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`pktail1ok` AS `pktail1ok`,`test`.`t1`.`pktail2ok` AS `pktail2ok`,`test`.`t1`.`pktail3bad` AS `pktail3bad`,`test`.`t1`.`pktail4bad` AS `pktail4bad`,`test`.`t1`.`pktail5bad` AS `pktail5bad`,`test`.`t1`.`pk2copy` AS `pk2copy`,`test`.`t1`.`badkey` AS `badkey`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where (((`test`.`t1`.`pktail2ok` = 1) and (`test`.`t1`.`pk1` < 50000)) or (`test`.`t1`.`key1` = 10))
explain select * from t1 where pktail3bad=1 and key1=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref key1,pktail3bad EITHER_KEY 4 const ROWS 0.91 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`pk1` AS `pk1`,`test`.`t1`.`pk2` AS `pk2`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`pktail1ok` AS `pktail1ok`,`test`.`t1`.`pktail2ok` AS `pktail2ok`,`test`.`t1`.`pktail3bad` AS `pktail3bad`,`test`.`t1`.`pktail4bad` AS `pktail4bad`,`test`.`t1`.`pktail5bad` AS `pktail5bad`,`test`.`t1`.`pk2copy` AS `pk2copy`,`test`.`t1`.`badkey` AS `badkey`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`key1` = 10) and (`test`.`t1`.`pktail3bad` = 1))
explain select * from t1 where pktail4bad=1 and key1=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref key1,pktail4bad pktail4bad 4 const ROWS 0.91 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`pk1` AS `pk1`,`test`.`t1`.`pk2` AS `pk2`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`pktail1ok` AS `pktail1ok`,`test`.`t1`.`pktail2ok` AS `pktail2ok`,`test`.`t1`.`pktail3bad` AS `pktail3bad`,`test`.`t1`.`pktail4bad` AS `pktail4bad`,`test`.`t1`.`pktail5bad` AS `pktail5bad`,`test`.`t1`.`pk2copy` AS `pk2copy`,`test`.`t1`.`badkey` AS `badkey`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`key1` = 10) and (`test`.`t1`.`pktail4bad` = 1))
explain select * from t1 where pktail5bad=1 and key1=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref key1,pktail5bad pktail5bad 4 const ROWS 0.91 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`pk1` AS `pk1`,`test`.`t1`.`pk2` AS `pk2`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`pktail1ok` AS `pktail1ok`,`test`.`t1`.`pktail2ok` AS `pktail2ok`,`test`.`t1`.`pktail3bad` AS `pktail3bad`,`test`.`t1`.`pktail4bad` AS `pktail4bad`,`test`.`t1`.`pktail5bad` AS `pktail5bad`,`test`.`t1`.`pk2copy` AS `pk2copy`,`test`.`t1`.`badkey` AS `badkey`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`key1` = 10) and (`test`.`t1`.`pktail5bad` = 1))
# Test for problem with innodb key values prefetch buffer:
explain select pk1,pk2,key1,key2 from t1 where key1 = 10 and key2=10 limit 10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge key1,key2 key1,key2 4,4 NULL 1 100.00 Using intersect(key1,key2); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`pk1` AS `pk1`,`test`.`t1`.`pk2` AS `pk2`,`test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2` from `test`.`t1` where ((`test`.`t1`.`key2` = 10) and (`test`.`t1`.`key1` = 10)) limit 10
select pk1,pk2,key1,key2 from t1 where key1 = 10 and key2=10 limit 10;
pk1 pk2 key1 key2
104 49 10 10
104 48 10 10
104 47 10 10
104 46 10 10
104 45 10 10
104 44 10 10
104 43 10 10
104 42 10 10
104 41 10 10
104 40 10 10
drop table t1;
# Testcase for BUG#4984
create table t1
(
RUNID varchar(22),
SUBMITNR varchar(5),
ORDERNR char(1),
PROGRAMM varchar(8),
TESTID varchar(4),
UCCHECK char(1),
ETEXT varchar(80),
ETEXT_TYPE char(1),
INFO char(1),
SEVERITY tinyint(3),
TADIRFLAG char(1),
PRIMARY KEY (RUNID,SUBMITNR,ORDERNR,PROGRAMM,TESTID,UCCHECK),
KEY `TVERM~KEY` (PROGRAMM,TESTID,UCCHECK)
) DEFAULT CHARSET=latin1;
update t1 set `ETEXT` = '', `ETEXT_TYPE`='', `INFO`='', `SEVERITY`='', `TADIRFLAG`=''
WHERE
`RUNID`= '' AND `SUBMITNR`= '' AND `ORDERNR`='' AND `PROGRAMM`='' AND
`TESTID`='' AND `UCCHECK`='';
drop table t1;
#
# Bug#50402 Optimizer producing wrong results when using Index Merge on InnoDB
#
CREATE TABLE t1 (f1 INT, PRIMARY KEY (f1));
INSERT INTO t1 VALUES (2);
CREATE TABLE t2 (f1 INT, f2 INT, f3 char(1),
PRIMARY KEY (f1), KEY (f2), KEY (f3) );
INSERT INTO t2 VALUES (1, 1, 'h'), (2, 3, 'h'), (3, 2, ''), (4, 2, '');
SELECT t1.f1 FROM t1
WHERE (SELECT COUNT(*) FROM t2 WHERE t2.f3 = 'h' AND t2.f2 = t1.f1) = 0 AND t1.f1 = 2;
f1
2
EXPLAIN SELECT t1.f1 FROM t1
WHERE (SELECT COUNT(*) FROM t2 WHERE t2.f3 = 'h' AND t2.f2 = t1.f1) = 0 AND t1.f1 = 2;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 NULL system PRIMARY NULL NULL NULL 1 100.00 NULL
2 DEPENDENT SUBQUERY t2 NULL ref f2,f3 f2 5 const 1 50.00 Using where
Warnings:
Note 1276 Field or reference 'test.t1.f1' of SELECT #2 was resolved in SELECT #1
Note 1003 /* select#1 */ select '2' AS `f1` from dual where (((/* select#2 */ select count(0) from `test`.`t2` where ((`test`.`t2`.`f2` = '2') and (`test`.`t2`.`f3` = 'h'))) = 0))
DROP TABLE t1,t2;
#
# Bug#19055268 ASSERT `!TABLE || (!TABLE->READ_SET || BITMAP_IS_SET(TABLE->READ_SET,...) FAILED
#
SET sql_mode = '';
Warnings:
Warning 3090 Changing sql mode 'NO_AUTO_CREATE_USER' is deprecated. It will be removed in a future release.
CREATE TABLE t1 (
pk int(11) NOT NULL AUTO_INCREMENT,
col_int_nokey int(11) NOT NULL,
col_int_key int(11) NOT NULL,
col_date_key date NOT NULL,
col_date_nokey date NOT NULL,
col_time_key time NOT NULL,
col_time_nokey time NOT NULL,
col_datetime_key datetime NOT NULL,
col_datetime_nokey datetime NOT NULL,
col_varchar_key varchar(1) NOT NULL,
col_varchar_nokey varchar(1) NOT NULL,
PRIMARY KEY (pk),
KEY col_int_key (col_int_key),
KEY col_date_key (col_date_key),
KEY col_time_key (col_time_key),
KEY col_datetime_key (col_datetime_key),
KEY col_varchar_key (col_varchar_key,col_int_key)
);
INSERT INTO t1 VALUES
(1,2,1,'0000-00-00','0000-00-00','00:00:07','00:00:25','0000-00-00 00:00:00','0000-00-00 00:00:00','2','2'),
(109,25,1,'0000-00-00','0000-00-00','00:00:07','00:00:25','0000-00-00 00:00:00','0000-00-00 00:00:00','1','7');
CREATE TABLE t2 (
pk int(11) NOT NULL AUTO_INCREMENT,
col_int_nokey int(11) NOT NULL,
col_int_key int(11) NOT NULL,
col_date_key date NOT NULL,
col_date_nokey date NOT NULL,
col_time_key time NOT NULL,
col_time_nokey time NOT NULL,
col_datetime_key datetime NOT NULL,
col_datetime_nokey datetime NOT NULL,
col_varchar_key varchar(1) NOT NULL,
col_varchar_nokey varchar(1) NOT NULL,
PRIMARY KEY (pk),
KEY col_int_key (col_int_key),
KEY col_date_key (col_date_key),
KEY col_time_key (col_time_key),
KEY col_datetime_key (col_datetime_key),
KEY col_varchar_key (col_varchar_key,col_int_key)
);
INSERT INTO t2 VALUES
(10,2,4,'2000-04-16','2000-04-16','17:02:34','17:02:34','2009-08-04 02:49:10','2009-08-04 02:49:10','u','u'),
(11,6,5,'1900-01-01','1900-01-01','12:31:32','12:31:32','2004-05-24 22:22:06','2004-05-24 22:22:06','b','b'),
(12,6,0,'2005-05-14','2005-05-14','16:49:31','16:49:31','1900-01-01 00:00:00','1900-01-01 00:00:00','c','c'),
(13,94,140,'2001-05-23','2001-05-23','00:00:00','00:00:00','2003-07-28 07:31:49','2003-07-28 07:31:49','f','f'),
(14,10,230,'2000-06-04','2000-06-04','20:23:27','20:23:27','2000-02-04 21:03:36','2000-02-04 21:03:36','g','g'),
(15,8,2,'1900-01-01','1900-01-01','10:31:09','10:31:09','2005-05-22 11:48:12','2005-05-22 11:48:12','q','q'),
(16,43,110,'2008-03-18','2008-03-18','09:58:35','09:58:35','1900-01-01 00:00:00','1900-01-01 00:00:00','n','n'),
(17,1,8,'2007-02-25','2007-02-25','05:39:28','05:39:28','2005-05-06 00:53:37','2005-05-06 00:53:37','c','c'),
(18,6,5,'2001-11-22','2001-11-22','00:00:00','00:00:00','2002-08-08 23:43:46','2002-08-08 23:43:46','x','x'),
(19,5,8,'0000-00-00','0000-00-00','00:00:00','00:00:00','2009-10-26 04:07:22','2009-10-26 04:07:22','n','n'),
(20,1,5,'2001-08-07','2001-08-07','14:06:09','14:06:09','2005-03-12 22:55:23','2005-03-12 22:55:23','r','r'),
(21,195,70,'2000-08-03','2000-08-03','00:00:00','00:00:00','2008-05-03 22:34:19','2008-05-03 22:34:19','j','j'),
(22,1,0,'2007-04-21','2007-04-21','17:43:27','17:43:27','2001-10-12 13:30:14','2001-10-12 13:30:14','l','l'),
(23,0,9,'2000-06-13','2000-06-13','12:23:15','12:23:15','2007-10-07 03:53:06','2007-10-07 03:53:06','h','h'),
(24,7,3,'0000-00-00','0000-00-00','19:35:06','19:35:06','2005-12-27 20:58:56','2005-12-27 20:58:56','z','z'),
(25,1,9,'2004-07-08','2004-07-08','10:16:08','10:16:08','2009-05-16 18:44:21','2009-05-16 18:44:21','z','z'),
(26,4,3,'2003-06-01','2003-06-01','00:00:00','00:00:00','2008-10-02 00:00:00','2008-10-02 00:00:00','d','d'),
(27,76,22,'0000-00-00','0000-00-00','16:51:15','16:51:15','2001-03-20 00:00:00','2001-03-20 00:00:00','l','l'),
(28,6,1,'1900-01-01','1900-01-01','00:00:00','00:00:00','1900-01-01 00:00:00','1900-01-01 00:00:00','s','s'),
(29,7,3,'2007-01-22','2007-01-22','00:00:00','00:00:00','2000-01-10 23:19:37','2000-01-10 23:19:37','k','k'),
(30,6,3,'2006-10-19','2006-10-19','21:46:20','21:46:20','2008-06-21 16:56:37','2008-06-21 16:56:37','l','l'),
(31,6,8,'2005-02-27','2005-02-27','00:00:00','00:00:00','2002-03-01 00:34:37','2002-03-01 00:34:37','t','t'),
(32,1,4,'2001-09-10','2001-09-10','03:34:16','03:34:16','2003-02-05 18:41:00','2003-02-05 18:41:00','n','n'),
(33,5,1,'2002-09-06','2002-09-06','11:25:31','11:25:31','2004-01-18 13:28:24','2004-01-18 13:28:24','z','z'),
(34,2,3,'2005-01-15','2005-01-15','17:00:53','17:00:53','2002-12-03 01:06:27','2002-12-03 01:06:27','f','f'),
(35,1,3,'1900-01-01','1900-01-01','23:32:47','23:32:47','2006-03-03 02:58:59','2006-03-03 02:58:59','q','q'),
(36,185,63,'2006-12-20','2006-12-20','00:00:00','00:00:00','2002-07-01 10:13:39','2002-07-01 10:13:39','l','l'),
(37,3,4,'2002-04-17','2002-04-17','12:15:05','12:15:05','2009-01-13 20:47:01','2009-01-13 20:47:01','a','a'),
(38,7,8,'2004-01-10','2004-01-10','22:26:38','22:26:38','2008-07-18 13:35:29','2008-07-18 13:35:29','c','c'),
(39,8,6,'2008-03-24','2008-03-24','00:00:00','00:00:00','2001-03-15 02:44:57','2001-03-15 02:44:57','c','c'),
(40,1,4,'2007-08-18','2007-08-18','00:00:00','00:00:00','2000-06-25 14:03:55','2000-06-25 14:03:55','i','i'),
(41,3,9,'2005-07-22','2005-07-22','00:00:00','00:00:00','2005-12-13 21:32:03','2005-12-13 21:32:03','r','r'),
(42,8,2,'2008-07-12','2008-07-12','08:59:37','08:59:37','2009-03-18 19:27:29','2009-03-18 19:27:29','g','g'),
(43,159,118,'2003-08-18','2003-08-18','07:19:50','07:19:50','2004-04-10 02:50:59','2004-04-10 02:50:59','l','l'),
(44,112,10,'2002-02-26','2002-02-26','03:51:46','03:51:46','2008-09-27 06:49:19','2008-09-27 06:49:19','w','w'),
(45,0,9,'2007-07-26','2007-07-26','15:57:32','15:57:32','2006-02-04 15:10:41','2006-02-04 15:10:41','b','b'),
(46,2,9,'1900-01-01','1900-01-01','02:57:08','02:57:08','2004-01-04 18:45:14','2004-01-04 18:45:14','i','i'),
(47,1,1,'2000-07-26','2000-07-26','00:21:15','00:21:15','2009-04-04 02:52:09','2009-04-04 02:52:09','o','o'),
(48,7,6,'2005-03-06','2005-03-06','23:35:02','23:35:02','2001-03-20 12:50:17','2001-03-20 12:50:17','f','f'),
(49,5,2,'2005-04-16','2005-04-16','09:21:51','09:21:51','2001-11-15 10:51:46','2001-11-15 10:51:46','a','a'),
(50,2,2,'2004-04-09','2004-04-09','19:21:02','19:21:02','2007-08-13 00:00:00','2007-08-13 00:00:00','j','j'),
(51,5,3,'2003-05-13','2003-05-13','03:16:22','03:16:22','1900-01-01 00:00:00','1900-01-01 00:00:00','k','k'),
(52,5,0,'0000-00-00','0000-00-00','00:00:00','00:00:00','2008-01-24 08:37:15','2008-01-24 08:37:15','x','x'),
(53,2,8,'2000-05-27','2000-05-27','18:19:51','18:19:51','2003-03-02 10:18:02','2003-03-02 10:18:02','r','r'),
(54,2,5,'2004-07-04','2004-07-04','01:42:17','01:42:17','2003-04-25 07:35:13','2003-04-25 07:35:13','t','t'),
(55,9,0,'2006-03-07','2006-03-07','00:00:00','00:00:00','2006-07-11 23:31:13','2006-07-11 23:31:13','p','p'),
(56,3,1,'2002-08-17','2002-08-17','20:32:51','20:32:51','2009-08-08 16:55:59','2009-08-08 16:55:59','g','g'),
(57,2,9,'2003-06-08','2003-06-08','10:04:19','10:04:19','1900-01-01 00:00:00','1900-01-01 00:00:00','q','q'),
(58,7,4,'1900-01-01','1900-01-01','06:39:26','06:39:26','2000-12-22 10:27:41','2000-12-22 10:27:41','m','m'),
(59,4,7,'2003-10-09','2003-10-09','15:48:26','15:48:26','2002-07-20 00:00:00','2002-07-20 00:00:00','l','l'),
(60,5,6,'2007-08-12','2007-08-12','02:17:23','02:17:23','2007-09-24 00:12:11','2007-09-24 00:12:11','d','d'),
(61,3,3,'2008-12-13','2008-12-13','07:48:47','07:48:47','2009-01-05 06:13:21','2009-01-05 06:13:21','n','n'),
(62,0,8,'0000-00-00','0000-00-00','09:09:14','09:09:14','2008-11-23 18:13:35','2008-11-23 18:13:35','l','l'),
(63,1,2,'2003-07-27','2003-07-27','22:46:23','22:46:23','2002-12-19 00:00:00','2002-12-19 00:00:00','c','c'),
(64,5,5,'2003-04-13','2003-04-13','19:42:42','19:42:42','2003-04-03 16:16:35','2003-04-03 16:16:35','v','v'),
(65,0,3,'2007-04-25','2007-04-25','15:15:32','15:15:32','2009-04-13 13:44:41','2009-04-13 13:44:41','z','z'),
(66,4,4,'2000-03-04','2000-03-04','02:50:26','02:50:26','2007-04-19 20:49:24','2007-04-19 20:49:24','h','h'),
(67,0,9,'2001-08-03','2001-08-03','14:44:31','14:44:31','2002-11-15 23:36:04','2002-11-15 23:36:04','y','y'),
(68,2,0,'2006-04-13','2006-04-13','00:00:00','00:00:00','2000-05-16 00:00:00','2000-05-16 00:00:00','o','o'),
(69,2,1,'2006-04-22','2006-04-22','07:31:27','07:31:27','2002-06-08 06:51:27','2002-06-08 06:51:27','h','h'),
(70,8,5,'2004-08-26','2004-08-26','10:48:57','10:48:57','2006-12-07 01:49:26','2006-12-07 01:49:26','h','h'),
(71,8,6,'2002-11-26','2002-11-26','00:00:00','00:00:00','1900-01-01 00:00:00','1900-01-01 00:00:00','c','c'),
(72,5,2,'2002-01-07','2002-01-07','23:06:00','23:06:00','2000-09-27 16:26:23','2000-09-27 16:26:23','m','m'),
(73,1,0,'2005-05-07','2005-05-07','05:56:02','05:56:02','1900-01-01 00:00:00','1900-01-01 00:00:00','s','s'),
(74,0,0,'2001-04-21','2001-04-21','10:44:22','10:44:22','2008-02-13 04:28:14','2008-02-13 04:28:14','t','t'),
(75,7,9,'2000-09-01','2000-09-01','00:00:00','00:00:00','2000-03-10 06:17:52','2000-03-10 06:17:52','r','r'),
(76,6,8,'2004-07-06','2004-07-06','01:44:26','01:44:26','2003-05-23 00:00:00','2003-05-23 00:00:00','u','u'),
(77,0,6,'0000-00-00','0000-00-00','00:00:00','00:00:00','1900-01-01 00:00:00','1900-01-01 00:00:00','h','h'),
(78,6,0,'2001-02-21','2001-02-21','17:01:49','17:01:49','2003-10-27 12:45:52','2003-10-27 12:45:52','p','p'),
(79,9,0,'2004-01-28','2004-01-28','16:27:14','16:27:14','2004-08-06 00:00:00','2004-08-06 00:00:00','z','z'),
(80,5,3,'2008-10-07','2008-10-07','00:00:00','00:00:00','2001-10-05 05:13:39','2001-10-05 05:13:39','h','h'),
(81,5,5,'0000-00-00','0000-00-00','10:34:22','10:34:22','2001-03-25 04:24:51','2001-03-25 04:24:51','q','q'),
(82,6,0,'2008-03-04','2008-03-04','10:48:51','10:48:51','2006-08-20 11:54:04','2006-08-20 11:54:04','l','l'),
(83,1,0,'2009-05-08','2009-05-08','16:55:06','16:55:06','2003-05-16 18:14:52','2003-05-16 18:14:52','p','p'),
(84,1,1,'2005-03-19','2005-03-19','14:46:32','14:46:32','2009-10-24 13:39:35','2009-10-24 13:39:35','t','t'),
(85,9,8,'2007-09-14','2007-09-14','16:26:50','16:26:50','2001-08-10 00:00:00','2001-08-10 00:00:00','o','o'),
(86,249,190,'2007-02-10','2007-02-10','06:35:32','06:35:32','2001-09-06 10:15:08','2001-09-06 10:15:08','o','o'),
(87,3,0,'2000-06-12','2000-06-12','02:28:38','02:28:38','2006-09-27 00:00:00','2006-09-27 00:00:00','p','p'),
(88,6,4,'2002-07-06','2002-07-06','00:00:00','00:00:00','2002-02-27 20:12:29','2002-02-27 20:12:29','e','e'),
(89,7,2,'2001-02-25','2001-02-25','04:52:29','04:52:29','1900-01-01 00:00:00','1900-01-01 00:00:00','u','u'),
(90,5,8,'2000-04-27','2000-04-27','00:00:00','00:00:00','2005-08-18 00:00:00','2005-08-18 00:00:00','z','z'),
(91,4,0,'2005-08-23','2005-08-23','09:11:04','09:11:04','2000-10-15 15:52:54','2000-10-15 15:52:54','j','j'),
(92,24,137,'2006-01-07','2006-01-07','22:38:18','22:38:18','2007-11-22 13:52:22','2007-11-22 13:52:22','e','e'),
(93,3,7,'2007-07-08','2007-07-08','13:23:13','13:23:13','2005-09-20 09:09:48','2005-09-20 09:09:48','k','k'),
(94,179,153,'2000-01-06','2000-01-06','15:33:10','15:33:10','2008-01-11 17:35:34','2008-01-11 17:35:34','d','d'),
(95,5,7,'0000-00-00','0000-00-00','09:20:10','09:20:10','2002-11-01 00:00:00','2002-11-01 00:00:00','q','q'),
(96,7,9,'2002-02-22','2002-02-22','11:19:10','11:19:10','2009-06-27 00:00:00','2009-06-27 00:00:00','j','j'),
(97,7,2,'2001-04-17','2001-04-17','08:08:41','08:08:41','2000-09-25 14:11:58','2000-09-25 14:11:58','j','j'),
(98,1,0,'2005-06-26','2005-06-26','10:17:36','10:17:36','2004-01-05 04:49:39','2004-01-05 04:49:39','e','e'),
(99,5,6,'2008-09-14','2008-09-14','00:00:00','00:00:00','1900-01-01 00:00:00','1900-01-01 00:00:00','f','f'),
(100,7,6,'0000-00-00','0000-00-00','01:05:02','01:05:02','2001-01-17 23:16:24','2001-01-17 23:16:24','a','a'),
(101,9,2,'2001-12-20','2001-12-20','00:00:00','00:00:00','1900-01-01 00:00:00','1900-01-01 00:00:00','o','o'),
(102,5,9,'2001-11-05','2001-11-05','00:00:00','00:00:00','2008-07-15 00:00:00','2008-07-15 00:00:00','y','y'),
(103,4,4,'1900-01-01','1900-01-01','15:32:04','15:32:04','2001-03-06 10:00:37','2001-03-06 10:00:37','d','d'),
(104,8,7,'2009-02-13','2009-02-13','20:25:36','20:25:36','2004-08-15 00:00:00','2004-08-15 00:00:00','z','z'),
(105,8,6,'2008-03-25','2008-03-25','21:33:53','21:33:53','2006-10-12 06:13:06','2006-10-12 06:13:06','s','s');
analyze table t1;
analyze table t2;
EXPLAIN UPDATE t1 SET col_time_nokey = 25
WHERE (col_varchar_key, col_varchar_nokey) IN (
SELECT col_int_key, col_int_key
FROM t2
WHERE (col_time_key, col_int_key, col_int_key) IN (
('s','a', 'm'), (0, 'n', 7)
)
);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 UPDATE t1 NULL ALL NULL NULL NULL NULL 2 100.00 Using where
2 DEPENDENT SUBQUERY t2 NULL index_merge col_int_key,col_time_key col_int_key,col_time_key 4,3 NULL 3 100.00 Using intersect(col_int_key,col_time_key); Using where; Using index
UPDATE t1 SET col_time_nokey = 25
WHERE (col_varchar_key, col_varchar_nokey) IN (
SELECT col_int_key, col_int_key
FROM t2
WHERE (col_time_key, col_int_key, col_int_key) IN (
('s','a', 'm'), (0, 'n', 7)
)
);
DROP TABLE t1, t2;
SET sql_mode = default;
#
# Generic @@optimizer_switch tests (move those into a separate file if
# we get another @@optimizer_switch user)
#
select @@optimizer_switch;
@@optimizer_switch
index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,duplicateweedout=on,subquery_materialization_cost_based=on,use_index_extensions=on,condition_fanout_filter=on,derived_merge=on,prefer_ordering_index=on
set optimizer_switch='index_merge=off,index_merge_union=off';
select @@optimizer_switch;
@@optimizer_switch
index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,duplicateweedout=on,subquery_materialization_cost_based=on,use_index_extensions=on,condition_fanout_filter=on,derived_merge=on,prefer_ordering_index=on
set optimizer_switch='index_merge_union=on';
select @@optimizer_switch;
@@optimizer_switch
index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,duplicateweedout=on,subquery_materialization_cost_based=on,use_index_extensions=on,condition_fanout_filter=on,derived_merge=on,prefer_ordering_index=on
set optimizer_switch='default,index_merge_sort_union=off';
select @@optimizer_switch;
@@optimizer_switch
index_merge=on,index_merge_union=on,index_merge_sort_union=off,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,duplicateweedout=on,subquery_materialization_cost_based=on,use_index_extensions=on,condition_fanout_filter=on,derived_merge=on,prefer_ordering_index=on
set optimizer_switch=4;
set optimizer_switch=NULL;
ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'NULL'
set optimizer_switch='default,index_merge';
ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'index_merge'
set optimizer_switch='index_merge=index_merge';
ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'index_merge=index_merge'
set optimizer_switch='index_merge=on,but...';
ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'but...'
set optimizer_switch='index_merge=';
ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'index_merge='
set optimizer_switch='index_merge';
ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'index_merge'
set optimizer_switch='on';
ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'on'
set optimizer_switch='index_merge=on,index_merge=off';
ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'index_merge=off'
set optimizer_switch='index_merge_union=on,index_merge_union=default';
ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'index_merge_union=default'
set optimizer_switch='default,index_merge=on,index_merge=off,default';
ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'index_merge=off,default'
set optimizer_switch=default;
set optimizer_switch='index_merge=off,index_merge_union=off,default';
select @@optimizer_switch;
@@optimizer_switch
index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,duplicateweedout=on,subquery_materialization_cost_based=on,use_index_extensions=on,condition_fanout_filter=on,derived_merge=on,prefer_ordering_index=on
set optimizer_switch=default;
select @@global.optimizer_switch;
@@global.optimizer_switch
index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,duplicateweedout=on,subquery_materialization_cost_based=on,use_index_extensions=on,condition_fanout_filter=on,derived_merge=on,prefer_ordering_index=on
set @@global.optimizer_switch=default;
select @@global.optimizer_switch;
@@global.optimizer_switch
index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,duplicateweedout=on,subquery_materialization_cost_based=on,use_index_extensions=on,condition_fanout_filter=on,derived_merge=on,prefer_ordering_index=on
#
# Check index_merge's @@optimizer_switch flags
#
select @@optimizer_switch;
@@optimizer_switch
index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,duplicateweedout=on,subquery_materialization_cost_based=on,use_index_extensions=on,condition_fanout_filter=on,derived_merge=on,prefer_ordering_index=on
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a int, b int, c int, filler char(100),
key(a), key(b), key(c));
insert into t1 select
A.a * B.a*10 + C.a*100,
A.a * B.a*10 + C.a*100,
A.a,
'filler'
from t0 A, t0 B, t0 C;
This should use union:
explain select * from t1 where a=1 or b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b a,b 5,5 NULL 2 100.00 Using union(a,b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler` AS `filler` from `test`.`t1` where ((`test`.`t1`.`a` = 1) or (`test`.`t1`.`b` = 1))
This should use ALL:
set optimizer_switch='default,index_merge=off';
explain select * from t1 where a=1 or b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ALL a,b NULL NULL NULL 1000 1.40 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler` AS `filler` from `test`.`t1` where ((`test`.`t1`.`a` = 1) or (`test`.`t1`.`b` = 1))
This should use sort-union:
set optimizer_switch='default,index_merge_union=off';
explain select * from t1 where a=1 or b=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b a,b 5,5 NULL 2 100.00 Using sort_union(a,b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler` AS `filler` from `test`.`t1` where ((`test`.`t1`.`a` = 1) or (`test`.`t1`.`b` = 1))
This will use sort-union:
set optimizer_switch=default;
explain select * from t1 where a<1 or b <1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b a,b 5,5 NULL 38 100.00 Using sort_union(a,b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler` AS `filler` from `test`.`t1` where ((`test`.`t1`.`a` < 1) or (`test`.`t1`.`b` < 1))
This should use ALL:
set optimizer_switch='default,index_merge_sort_union=off';
explain select * from t1 where a<1 or b <1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ALL a,b NULL NULL NULL 1000 55.55 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler` AS `filler` from `test`.`t1` where ((`test`.`t1`.`a` < 1) or (`test`.`t1`.`b` < 1))
This should use ALL:
set optimizer_switch='default,index_merge=off';
explain select * from t1 where a<1 or b <1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ALL a,b NULL NULL NULL 1000 55.55 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler` AS `filler` from `test`.`t1` where ((`test`.`t1`.`a` < 1) or (`test`.`t1`.`b` < 1))
This will use sort-union:
set optimizer_switch='default,index_merge_union=off';
explain select * from t1 where a<1 or b <1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b a,b 5,5 NULL 38 100.00 Using sort_union(a,b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler` AS `filler` from `test`.`t1` where ((`test`.`t1`.`a` < 1) or (`test`.`t1`.`b` < 1))
alter table t1 add d int, add key(d);
update t1 set d=a;
This will use sort_union:
set optimizer_switch=default;
explain select * from t1 where (a=3 or b in (1,2)) and (c=3 or d=4);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b,c,d a,b 5,5 NULL 3 10.09 Using sort_union(a,b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler` AS `filler`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (((`test`.`t1`.`a` = 3) or (`test`.`t1`.`b` in (1,2))) and ((`test`.`t1`.`c` = 3) or (`test`.`t1`.`d` = 4)))
And if we disable sort_union, union:
set optimizer_switch='default,index_merge_sort_union=off';
explain select * from t1 where (a=3 or b in (1,2)) and (c=3 or d=4);
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b,c,d c,d 5,5 NULL 100 20.56 Using union(c,d); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler` AS `filler`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (((`test`.`t1`.`a` = 3) or (`test`.`t1`.`b` in (1,2))) and ((`test`.`t1`.`c` = 3) or (`test`.`t1`.`d` = 4)))
drop table t1;
create table t1 (
a int, b int, c int,
filler1 char(200), filler2 char(200),
key(a),key(b),key(c)
);
insert into t1
select A.a+10*B.a, A.a+10*B.a, A.a+10*B.a+100*C.a, 'foo', 'bar'
from t0 A, t0 B, t0 C, t0 D where D.a<5;
This should be intersect:
set optimizer_switch=default;
explain select * from t1 where a=10 and b=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b a,b 5,5 NULL 1 100.00 Using intersect(a,b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`b` = 10) and (`test`.`t1`.`a` = 10))
No intersect when index_merge is disabled:
set optimizer_switch='default,index_merge=off';
explain select * from t1 where a=10 and b=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref a,b a 5 const 49 0.98 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`b` = 10) and (`test`.`t1`.`a` = 10))
No intersect if it is disabled:
set optimizer_switch='default,index_merge_intersection=off';
explain select * from t1 where a=10 and b=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref a,b a 5 const 49 0.98 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`b` = 10) and (`test`.`t1`.`a` = 10))
Do intersect when union was disabled
set optimizer_switch='default,index_merge_union=off';
explain select * from t1 where a=10 and b=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b a,b 5,5 NULL 1 100.00 Using intersect(a,b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`b` = 10) and (`test`.`t1`.`a` = 10))
Do intersect when sort_union was disabled
set optimizer_switch='default,index_merge_sort_union=off';
explain select * from t1 where a=10 and b=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b a,b 5,5 NULL 1 100.00 Using intersect(a,b); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where ((`test`.`t1`.`b` = 10) and (`test`.`t1`.`a` = 10))
This will use intersection inside a union:
set optimizer_switch=default;
explain select * from t1 where a=10 and b=10 or c=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b,c a,b,c 5,5,5 NULL 6 100.00 Using union(intersect(a,b),c); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where (((`test`.`t1`.`b` = 10) and (`test`.`t1`.`a` = 10)) or (`test`.`t1`.`c` = 10))
Should be only union left:
set optimizer_switch='default,index_merge_intersection=off';
explain select * from t1 where a=10 and b=10 or c=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b,c a,c 5,5 NULL 54 100.00 Using union(a,c); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where (((`test`.`t1`.`b` = 10) and (`test`.`t1`.`a` = 10)) or (`test`.`t1`.`c` = 10))
This will switch to sort-union (intersection will be gone, too,
thats a known limitation:
set optimizer_switch='default,index_merge_union=off';
explain select * from t1 where a=10 and b=10 or c=10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge a,b,c a,c 5,5 NULL 54 100.00 Using sort_union(a,c); Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t1` where (((`test`.`t1`.`b` = 10) and (`test`.`t1`.`a` = 10)) or (`test`.`t1`.`c` = 10))
set optimizer_switch=default;
show variables like 'optimizer_switch';
Variable_name Value
optimizer_switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,duplicateweedout=on,subquery_materialization_cost_based=on,use_index_extensions=on,condition_fanout_filter=on,derived_merge=on,prefer_ordering_index=on
drop table t0, t1;