mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-01-17 20:42:30 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions
mariadb/mysql-test/r/negation_elimination.result
Sergey Petrunya 96e092dc73 Backport into MariaDB-5.2 the following: 
WL#2474 "Multi Range Read: Change the default MRR implementation to implement new MRR interface"
WL#2475 "Batched range read functions for MyISAM/InnoDb"
        "Index condition pushdown for MyISAM/InnoDB"
Igor's fix from sp1r-igor@olga.mysql.com-20080330055902-07614:
  There could be observed the following problems:
  1. EXPLAIN did not mention pushdown conditions from on expressions in the 
  'extra' column.  As a result if a query had no where conditions pushed 
  down to a table, but had on conditions pushed to this table the 'extra' 
  column in the EXPLAIN for the table missed 'using where'.
  2. Conditions for ref access were not eliminated from on expressions 
  though such conditions were eliminated from the where condition.
2009-12-15 10:16:46 +03:00

391 lines
7.1 KiB
Text
Raw Blame History

drop table if exists t1;
create table t1 (a int, key (a));
insert into t1 values (NULL), (0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
(10), (11), (12), (13), (14), (15), (16), (17), (18), (19);
explain select * from t1 where not(not(a));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 5 NULL 21 Using where; Using index
select * from t1 where not(not(a));
a
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where not(not(not(a > 10)));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
select * from t1 where not(not(not(a > 10)));
a
0
1
2
3
4
5
6
7
8
9
10
explain select * from t1 where not(not(not(a < 5) and not(a > 10)));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 5 Using where; Using index
select * from t1 where not(not(not(a < 5) and not(a > 10)));
a
5
6
7
8
9
10
explain select * from t1 where not(a = 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 19 Using where; Using index
select * from t1 where not(a = 10);
a
0
1
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
explain select * from t1 where not(a != 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 5 const 1 Using index
select * from t1 where not(a != 1);
a
1
explain select * from t1 where not(a < 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 11 Using where; Using index
select * from t1 where not(a < 10);
a
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where not(a >= 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 9 Using where; Using index
select * from t1 where not(a >= 10);
a
0
1
2
3
4
5
6
7
8
9
explain select * from t1 where not(a > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
select * from t1 where not(a > 10);
a
0
1
2
3
4
5
6
7
8
9
10
explain select * from t1 where not(a <= 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
select * from t1 where not(a <= 10);
a
11
12
13
14
15
16
17
18
19
explain select * from t1 where not(a is null);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 20 Using where; Using index
select * from t1 where not(a is null);
a
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where not(a is not null);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 5 const 1 Using where; Using index
select * from t1 where not(a is not null);
a
NULL
explain select * from t1 where not(a < 5 or a > 15);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
select * from t1 where not(a < 5 or a > 15);
a
5
6
7
8
9
10
11
12
13
14
15
explain select * from t1 where not(a < 15 and a > 5);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 12 Using where; Using index
select * from t1 where not(a < 15 and a > 5);
a
0
1
2
3
4
5
15
16
17
18
19
explain select * from t1 where a = 2 or not(a < 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 12 Using where; Using index
select * from t1 where a = 2 or not(a < 10);
a
2
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where a > 5 and not(a > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 4 Using where; Using index
select * from t1 where a > 5 and not(a > 10);
a
6
7
8
9
10
explain select * from t1 where a > 5 xor a < 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 5 NULL 21 Using where; Using index
select * from t1 where a > 5 xor a < 10;
a
0
1
2
3
4
5
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where a = 2 or not(a < 5 or a > 15);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 11 Using where; Using index
select * from t1 where a = 2 or not(a < 5 or a > 15);
a
2
5
6
7
8
9
10
11
12
13
14
15
explain select * from t1 where a = 7 or not(a < 15 and a > 5);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 13 Using where; Using index
select * from t1 where a = 7 or not(a < 15 and a > 5);
a
0
1
2
3
4
5
7
15
16
17
18
19
explain select * from t1 where NULL or not(a < 15 and a > 5);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 12 Using where; Using index
select * from t1 where NULL or not(a < 15 and a > 5);
a
0
1
2
3
4
5
15
16
17
18
19
explain select * from t1 where not(NULL and a > 5);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 6 Using where; Using index
select * from t1 where not(NULL and a > 5);
a
0
1
2
3
4
5
explain select * from t1 where not(NULL or a);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
select * from t1 where not(NULL or a);
a
explain select * from t1 where not(NULL and a);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 5 NULL 21 Using where; Using index
select * from t1 where not(NULL and a);
a
0
explain select * from t1 where not((a < 5 or a < 10) and (not(a > 16) or a > 17));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 11 Using where; Using index
select * from t1 where not((a < 5 or a < 10) and (not(a > 16) or a > 17));
a
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where not((a < 5 and a < 10) and (not(a > 16) or a > 17));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 15 Using where; Using index
select * from t1 where not((a < 5 and a < 10) and (not(a > 16) or a > 17));
a
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
explain select * from t1 where ((a between 5 and 15) and (not(a like 10)));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 10 Using where; Using index
select * from t1 where ((a between 5 and 15) and (not(a like 10)));
a
5
6
7
8
9
11
12
13
14
15
delete from t1 where a > 3;
select a, not(not(a)) from t1;
a not(not(a))
NULL NULL
0 0
1 1
2 1
3 1
explain extended select a, not(not(a)), not(a <= 2 and not(a)), not(a not like "1"), not (a not in (1,2)), not(a != 2) from t1 where not(not(a)) having not(not(a));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 index NULL a 5 NULL 5 100.00 Using where; Using index
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a`,(`test`.`t1`.`a` <> 0) AS `not(not(a))`,((`test`.`t1`.`a` > 2) or `test`.`t1`.`a`) AS `not(a <= 2 and not(a))`,(`test`.`t1`.`a` like '1') AS `not(a not like "1")`,(`test`.`t1`.`a` in (1,2)) AS `not (a not in (1,2))`,(`test`.`t1`.`a` = 2) AS `not(a != 2)` from `test`.`t1` where `test`.`t1`.`a` having `test`.`t1`.`a`
drop table t1;
Reference in a new issue View git blame Copy permalink