mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 20:12:31 +01:00
941018f8d1
Analysis: The fix for lp:944706 introduces early subquery optimization. While a subquery is being optimized some of its predicates may be removed. In the test case, the EXISTS subquery is constant, and is evaluated to TRUE. As a result the whole OR is TRUE, and thus the correlated condition "b = alias1.b" is optimized away. The subquery becomes non-correlated. The subquery cache is designed to work only for correlated subqueries. If constant subquery optimization is disallowed, then the constant subquery is not evaluated, the subquery remains correlated, and its execution is cached. As a result execution is fast. However, when the constant subquery was optimized away, it was neither cached by the subquery cache, nor it was cached by the internal subquery caching. The latter was due to the fact that the subquery still appeared as correlated to the subselect_XYZ_engine::exec methods, and they re-executed the subquery on each call to Item_subselect::exec. Solution: The solution is to update the correlated status of the subquery after it has been optimized. This status consists of: - st_select_lex::is_correlated - Item_subselect::is_correlated - SELECT_LEX::uncacheable - SELECT_LEX_UNIT::uncacheable The status is updated by st_select_lex::update_correlated_cache(), and its caller st_select_lex::optimize_unflattened_subqueries. The solution relies on the fact that the optimizer already called st_select_lex::update_used_tables() for each subquery. This allows to efficiently update the correlated status of each subquery without walking the whole subquery tree. Notice that his patch is an improvement over MySQL 5.6 and older, where subqueries are not pre-optimized, and the above analysis is not possible.
484 lines
25 KiB
Text
484 lines
25 KiB
Text
set @subselect_extra_no_sj_tmp=@@optimizer_switch;
|
|
set @optimizer_switch_for_subselect_extra_test='semijoin=off,firstmatch=off,loosescan=off,semijoin_with_cache=off';
|
|
drop table if exists t1,t2,t3,t4;
|
|
drop view if exists v1,v2,v3;
|
|
set @subselect_extra_tmp=@@optimizer_switch;
|
|
set @@optimizer_switch=ifnull(@optimizer_switch_for_subselect_extra_test,
|
|
"semijoin=on,firstmatch=on,loosescan=on,semijoin_with_cache=on,partial_match_rowid_merge=off,partial_match_table_scan=off");
|
|
# From explain.test:
|
|
#
|
|
# Bug#37870: Usage of uninitialized value caused failed assertion.
|
|
#
|
|
create table t1 (dt datetime not null, t time not null);
|
|
create table t2 (dt datetime not null);
|
|
insert into t1 values ('2001-01-01 1:1:1', '1:1:1'),
|
|
('2001-01-01 1:1:1', '1:1:1');
|
|
insert into t2 values ('2001-01-01 1:1:1'), ('2001-01-01 1:1:1');
|
|
flush tables;
|
|
EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL );
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY OUTR ALL NULL NULL NULL NULL 2 Using where
|
|
2 DEPENDENT SUBQUERY INNR ALL NULL NULL NULL NULL 2 Using where
|
|
flush tables;
|
|
SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL );
|
|
dt
|
|
flush tables;
|
|
EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' );
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY OUTR ALL NULL NULL NULL NULL 2 Using where
|
|
2 DEPENDENT SUBQUERY INNR ALL NULL NULL NULL NULL 2 Using where
|
|
flush tables;
|
|
SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' );
|
|
dt
|
|
2001-01-01 01:01:01
|
|
2001-01-01 01:01:01
|
|
drop tables t1, t2;
|
|
# From type_datetime.test:
|
|
#
|
|
# Bug #32694: NOT NULL table field in a subquery produces invalid results
|
|
#
|
|
create table t1 (id int(10) not null, cur_date datetime not null);
|
|
create table t2 (id int(10) not null, cur_date date not null);
|
|
insert into t1 (id, cur_date) values (1, '2007-04-25 18:30:22');
|
|
insert into t2 (id, cur_date) values (1, '2007-04-25');
|
|
explain extended
|
|
select * from t1
|
|
where id in (select id from t1 as x1 where (t1.cur_date is null));
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
|
|
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
|
|
Warnings:
|
|
Note 1276 Field or reference 'test.t1.cur_date' of SELECT #2 was resolved in SELECT #1
|
|
Note 1003 select 1 AS `id`,'2007-04-25 18:30:22' AS `cur_date` from dual where <expr_cache><1>(<in_optimizer>(1,<exists>(select `test`.`x1`.`id` from `test`.`t1` `x1` where 0)))
|
|
select * from t1
|
|
where id in (select id from t1 as x1 where (t1.cur_date is null));
|
|
id cur_date
|
|
explain extended
|
|
select * from t2
|
|
where id in (select id from t2 as x1 where (t2.cur_date is null));
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY t2 system NULL NULL NULL NULL 1 100.00
|
|
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
|
|
Warnings:
|
|
Note 1276 Field or reference 'test.t2.cur_date' of SELECT #2 was resolved in SELECT #1
|
|
Note 1003 select 1 AS `id`,'2007-04-25' AS `cur_date` from dual where <expr_cache><1>(<in_optimizer>(1,<exists>(select `test`.`x1`.`id` from `test`.`t2` `x1` where 0)))
|
|
select * from t2
|
|
where id in (select id from t2 as x1 where (t2.cur_date is null));
|
|
id cur_date
|
|
insert into t1 (id, cur_date) values (2, '2007-04-26 18:30:22');
|
|
insert into t2 (id, cur_date) values (2, '2007-04-26');
|
|
explain extended
|
|
select * from t1
|
|
where id in (select id from t1 as x1 where (t1.cur_date is null));
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 Using where
|
|
2 DEPENDENT SUBQUERY x1 ALL NULL NULL NULL NULL 2 100.00 Using where
|
|
Warnings:
|
|
Note 1276 Field or reference 'test.t1.cur_date' of SELECT #2 was resolved in SELECT #1
|
|
Note 1003 select `test`.`t1`.`id` AS `id`,`test`.`t1`.`cur_date` AS `cur_date` from `test`.`t1` where <expr_cache><`test`.`t1`.`id`,`test`.`t1`.`cur_date`>(<in_optimizer>(`test`.`t1`.`id`,<exists>(select `test`.`x1`.`id` from `test`.`t1` `x1` where ((`test`.`t1`.`cur_date` = 0) and (<cache>(`test`.`t1`.`id`) = `test`.`x1`.`id`)))))
|
|
select * from t1
|
|
where id in (select id from t1 as x1 where (t1.cur_date is null));
|
|
id cur_date
|
|
explain extended
|
|
select * from t2
|
|
where id in (select id from t2 as x1 where (t2.cur_date is null));
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
|
|
2 DEPENDENT SUBQUERY x1 ALL NULL NULL NULL NULL 2 100.00 Using where
|
|
Warnings:
|
|
Note 1276 Field or reference 'test.t2.cur_date' of SELECT #2 was resolved in SELECT #1
|
|
Note 1003 select `test`.`t2`.`id` AS `id`,`test`.`t2`.`cur_date` AS `cur_date` from `test`.`t2` where <expr_cache><`test`.`t2`.`id`,`test`.`t2`.`cur_date`>(<in_optimizer>(`test`.`t2`.`id`,<exists>(select `test`.`x1`.`id` from `test`.`t2` `x1` where ((`test`.`t2`.`cur_date` = 0) and (<cache>(`test`.`t2`.`id`) = `test`.`x1`.`id`)))))
|
|
select * from t2
|
|
where id in (select id from t2 as x1 where (t2.cur_date is null));
|
|
id cur_date
|
|
drop table t1,t2;
|
|
#
|
|
# From group_min_max.test
|
|
#
|
|
create table t1 (
|
|
a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(64) default ' '
|
|
);
|
|
insert into t1 (a1, a2, b, c, d) values
|
|
('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
|
|
('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
|
|
('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
|
|
('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
|
|
('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
|
|
('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
|
|
('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
|
|
('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
|
|
('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
|
|
('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
|
|
('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
|
|
('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'),
|
|
('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'),
|
|
('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'),
|
|
('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'),
|
|
('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4'),
|
|
('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
|
|
('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
|
|
('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
|
|
('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
|
|
('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
|
|
('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
|
|
('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
|
|
('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
|
|
('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
|
|
('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
|
|
('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
|
|
('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'),
|
|
('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'),
|
|
('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'),
|
|
('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'),
|
|
('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4');
|
|
create index idx_t1_0 on t1 (a1);
|
|
create index idx_t1_1 on t1 (a1,a2,b,c);
|
|
create index idx_t1_2 on t1 (a1,a2,b);
|
|
analyze table t1;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status Table is already up to date
|
|
create table t2 (
|
|
a1 char(64), a2 char(64) not null, b char(16), c char(16), d char(16), dummy char(64) default ' '
|
|
);
|
|
insert into t2 select * from t1;
|
|
insert into t2 (a1, a2, b, c, d) values
|
|
('a','a',NULL,'a777','xyz'),('a','a',NULL,'a888','xyz'),('a','a',NULL,'a999','xyz'),
|
|
('a','a','a',NULL,'xyz'),
|
|
('a','a','b',NULL,'xyz'),
|
|
('a','b','a',NULL,'xyz'),
|
|
('c','a',NULL,'c777','xyz'),('c','a',NULL,'c888','xyz'),('c','a',NULL,'c999','xyz'),
|
|
('d','b','b',NULL,'xyz'),
|
|
('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),
|
|
('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),
|
|
('a','a',NULL,'a777','xyz'),('a','a',NULL,'a888','xyz'),('a','a',NULL,'a999','xyz'),
|
|
('a','a','a',NULL,'xyz'),
|
|
('a','a','b',NULL,'xyz'),
|
|
('a','b','a',NULL,'xyz'),
|
|
('c','a',NULL,'c777','xyz'),('c','a',NULL,'c888','xyz'),('c','a',NULL,'c999','xyz'),
|
|
('d','b','b',NULL,'xyz'),
|
|
('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),
|
|
('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz');
|
|
create index idx_t2_0 on t2 (a1);
|
|
create index idx_t2_1 on t2 (a1,a2,b,c);
|
|
create index idx_t2_2 on t2 (a1,a2,b);
|
|
analyze table t2;
|
|
Table Op Msg_type Msg_text
|
|
test.t2 analyze status Table is already up to date
|
|
create table t3 (
|
|
a1 char(1), a2 char(1), b char(1), c char(4) not null, d char(3), dummy char(1) default ' '
|
|
);
|
|
insert into t3 (a1, a2, b, c, d) values
|
|
('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
|
|
('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
|
|
('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
|
|
('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
|
|
('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
|
|
('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
|
|
('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
|
|
('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
|
|
('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
|
|
('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
|
|
('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
|
|
('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4');
|
|
insert into t3 (a1, a2, b, c, d) values
|
|
('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
|
|
('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
|
|
('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
|
|
('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
|
|
('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
|
|
('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
|
|
('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
|
|
('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
|
|
('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
|
|
('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
|
|
('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
|
|
('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4');
|
|
insert into t3 (a1, a2, b, c, d) values
|
|
('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
|
|
('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
|
|
('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
|
|
('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
|
|
('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
|
|
('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
|
|
('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
|
|
('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
|
|
('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
|
|
('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
|
|
('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
|
|
('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4');
|
|
insert into t3 (a1, a2, b, c, d) values
|
|
('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
|
|
('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
|
|
('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
|
|
('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
|
|
('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
|
|
('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
|
|
('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
|
|
('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
|
|
('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
|
|
('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
|
|
('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
|
|
('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4');
|
|
create index idx_t3_0 on t3 (a1);
|
|
create index idx_t3_1 on t3 (a1,a2,b,c);
|
|
create index idx_t3_2 on t3 (a1,a2,b);
|
|
analyze table t3;
|
|
Table Op Msg_type Msg_text
|
|
test.t3 analyze status Table is already up to date
|
|
explain select a1,a2,b,c,min(c), max(c) from t1
|
|
where exists ( select * from t2
|
|
where t2.c in (select c from t3 where t3.c > t1.b) and
|
|
t2.c > 'b1' )
|
|
group by a1,a2,b;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 range NULL idx_t1_1 147 NULL 17 Using where; Using index for group-by
|
|
2 DEPENDENT SUBQUERY t2 index NULL idx_t2_1 163 NULL 164 Using where; Using index
|
|
3 DEPENDENT SUBQUERY t3 index NULL idx_t3_1 10 NULL 192 Using where; Using index
|
|
select a1,a2,b,c,min(c), max(c) from t1
|
|
where exists ( select * from t2
|
|
where t2.c in (select c from t3 where t3.c > t1.b) and
|
|
t2.c > 'b1' )
|
|
group by a1,a2,b;
|
|
a1 a2 b c min(c) max(c)
|
|
a a a d111 a111 d111
|
|
a a b h112 e112 h112
|
|
a b a l121 i121 l121
|
|
a b b p122 m122 p122
|
|
b a a d211 a211 d211
|
|
b a b h212 e212 h212
|
|
b b a l221 i221 l221
|
|
b b b p222 m222 p222
|
|
c a a d311 a311 d311
|
|
c a b h312 e312 h312
|
|
c b a l321 i321 l321
|
|
c b b p322 m322 p322
|
|
d a a d411 a411 d411
|
|
d a b h412 e412 h412
|
|
d b a l421 i421 l421
|
|
d b b p422 m422 p422
|
|
explain select a1,a2,b,c,min(c), max(c) from t1
|
|
where exists ( select * from t2
|
|
where t2.c in (select c from t3 where t3.c > t1.c) and
|
|
t2.c > 'b1' )
|
|
group by a1,a2,b;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 index NULL idx_t1_1 163 NULL 128 Using where; Using index
|
|
2 DEPENDENT SUBQUERY t2 index NULL idx_t2_1 163 NULL 164 Using where; Using index
|
|
3 DEPENDENT SUBQUERY t3 index NULL idx_t3_1 10 NULL 192 Using where; Using index
|
|
select a1,a2,b,c,min(c), max(c) from t1
|
|
where exists ( select * from t2
|
|
where t2.c in (select c from t3 where t3.c > t1.c) and
|
|
t2.c > 'b1' )
|
|
group by a1,a2,b;
|
|
a1 a2 b c min(c) max(c)
|
|
a a a a111 a111 d111
|
|
a a b e112 e112 h112
|
|
a b a i121 i121 l121
|
|
a b b m122 m122 p122
|
|
b a a a211 a211 d211
|
|
b a b e212 e212 h212
|
|
b b a i221 i221 l221
|
|
b b b m222 m222 p222
|
|
c a a a311 a311 d311
|
|
c a b e312 e312 h312
|
|
c b a i321 i321 l321
|
|
c b b m322 m322 o322
|
|
d a a a411 a411 d411
|
|
d a b e412 e412 h412
|
|
d b a i421 i421 l421
|
|
d b b m422 m422 o422
|
|
drop table t1, t2, t3;
|
|
#
|
|
# From group_by.test
|
|
#
|
|
# Bug #21174: Index degrades sort performance and
|
|
# optimizer does not honor IGNORE INDEX.
|
|
# a.k.a WL3527.
|
|
#
|
|
CREATE TABLE t1 (a INT, b INT,
|
|
PRIMARY KEY (a),
|
|
KEY i2(a,b));
|
|
INSERT INTO t1 VALUES (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8);
|
|
INSERT INTO t1 SELECT a + 8,b FROM t1;
|
|
INSERT INTO t1 SELECT a + 16,b FROM t1;
|
|
INSERT INTO t1 SELECT a + 32,b FROM t1;
|
|
INSERT INTO t1 SELECT a + 64,b FROM t1;
|
|
INSERT INTO t1 SELECT a + 128,b FROM t1 limit 16;
|
|
ANALYZE TABLE t1;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status OK
|
|
EXPLAIN SELECT 1 FROM t1 WHERE a IN
|
|
(SELECT a FROM t1 USE INDEX (i2) IGNORE INDEX (i2));
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 index NULL PRIMARY 4 NULL 144 Using where; Using index
|
|
2 MATERIALIZED t1 ALL NULL NULL NULL NULL 144
|
|
CREATE TABLE t2 (a INT, b INT, KEY(a));
|
|
INSERT INTO t2 VALUES (1, 1), (2, 2), (3,3), (4,4);
|
|
EXPLAIN SELECT a, SUM(b) FROM t2 GROUP BY a LIMIT 2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 index NULL a 5 NULL 2
|
|
EXPLAIN SELECT a, SUM(b) FROM t2 IGNORE INDEX (a) GROUP BY a LIMIT 2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 ALL NULL NULL NULL NULL 4 Using temporary; Using filesort
|
|
EXPLAIN SELECT 1 FROM t2 WHERE a IN
|
|
(SELECT a FROM t1 USE INDEX (i2) IGNORE INDEX (i2));
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 index NULL a 5 NULL 4 Using where; Using index
|
|
2 MATERIALIZED t1 ALL NULL NULL NULL NULL 144
|
|
DROP TABLE t1, t2;
|
|
#
|
|
# From derived_view.test
|
|
#
|
|
set @tmp_subselect_extra_derived=@@optimizer_switch;
|
|
set optimizer_switch='derived_merge=on,derived_with_keys=on';
|
|
#
|
|
# LP bug #806504: right join over a view/derived table
|
|
#
|
|
CREATE TABLE t1 (a int, b int) ;
|
|
INSERT INTO t1 VALUES (0,0);
|
|
CREATE TABLE t2 (a int) ;
|
|
INSERT INTO t2 VALUES (0), (0);
|
|
CREATE VIEW v1 AS SELECT * FROM t1;
|
|
SELECT * FROM t2 RIGHT JOIN (SELECT * FROM t1) AS t ON t.a != 0
|
|
WHERE t.a IN (SELECT b FROM t1);
|
|
a a b
|
|
NULL 0 0
|
|
EXPLAIN EXTENDED
|
|
SELECT * FROM t2 RIGHT JOIN (SELECT * FROM t1) AS t ON t.a != 0
|
|
WHERE t.a IN (SELECT b FROM t1);
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
|
|
3 MATERIALIZED t1 system NULL NULL NULL NULL 1 100.00
|
|
Warnings:
|
|
Note 1003 select `test`.`t2`.`a` AS `a`,0 AS `a`,0 AS `b` from `test`.`t2` where <expr_cache><0>(<in_optimizer>(0,0 in ( <materialize> (select 0 from dual ), <primary_index_lookup>(0 in <temporary table> on distinct_key where ((0 = `<subquery3>`.`b`))))))
|
|
SELECT * FROM t2 RIGHT JOIN v1 AS t ON t.a != 0
|
|
WHERE t.a IN (SELECT b FROM t1);
|
|
a a b
|
|
NULL 0 0
|
|
EXPLAIN EXTENDED
|
|
SELECT * FROM t2 RIGHT JOIN v1 AS t ON t.a != 0
|
|
WHERE t.a IN (SELECT b FROM t1);
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
|
|
2 MATERIALIZED t1 system NULL NULL NULL NULL 1 100.00
|
|
Warnings:
|
|
Note 1003 select `test`.`t2`.`a` AS `a`,0 AS `a`,0 AS `b` from `test`.`t2` where <expr_cache><0>(<in_optimizer>(0,0 in ( <materialize> (select 0 from dual ), <primary_index_lookup>(0 in <temporary table> on distinct_key where ((0 = `<subquery2>`.`b`))))))
|
|
DROP VIEW v1;
|
|
DROP TABLE t1,t2;
|
|
#
|
|
# LP bug #793448: materialized view accessed by two-component key
|
|
#
|
|
CREATE TABLE t1 (a int, b int);
|
|
INSERT INTO t1 VALUES (9,3), (2,5);
|
|
CREATE TABLE t2 (a int, b int);
|
|
INSERT INTO t2 VALUES (9,3), (3,7), (9,1), (2,5), (2,4), (3,8);
|
|
CREATE TABLE t3 (a int, b int);
|
|
INSERT INTO t3 VALUES (10,3), (9,7), (9,1), (2,4);
|
|
CREATE VIEW v1(a,b) AS SELECT a, MAX(b) FROM t2 GROUP BY a;
|
|
CREATE VIEW v2(a,b) AS SELECT a,b FROM t2 UNION SELECT a,b FROM t3;
|
|
SELECT * FROM v1;
|
|
a b
|
|
2 5
|
|
3 8
|
|
9 3
|
|
SELECT a FROM t1 WHERE (a,b) IN (SELECT * FROM v1);
|
|
a
|
|
9
|
|
2
|
|
EXPLAIN
|
|
SELECT a FROM t1 WHERE (a,b) IN (SELECT * FROM v1);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
|
|
2 DEPENDENT SUBQUERY <derived3> index_subquery key0 key0 10 func,func 2 Using where
|
|
3 DERIVED t2 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort
|
|
SELECT * FROM v2;
|
|
a b
|
|
9 3
|
|
3 7
|
|
9 1
|
|
2 5
|
|
2 4
|
|
3 8
|
|
10 3
|
|
9 7
|
|
SELECT a FROM t1 WHERE (a,b) IN (SELECT * FROM v2);
|
|
a
|
|
9
|
|
2
|
|
EXPLAIN
|
|
SELECT a FROM t1 WHERE (a,b) IN (SELECT * FROM v2);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
|
|
2 DEPENDENT SUBQUERY <derived3> index_subquery key0 key0 10 func,func 2 Using where
|
|
3 DERIVED t2 ALL NULL NULL NULL NULL 6
|
|
4 UNION t3 ALL NULL NULL NULL NULL 4
|
|
NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
|
|
DROP VIEW v1,v2;
|
|
DROP TABLE t1,t2,t3;
|
|
#
|
|
# LP bug #874006: materialized view used in IN subquery
|
|
#
|
|
CREATE TABLE t3 (a int NOT NULL, b varchar(1), c varchar(1));
|
|
INSERT INTO t3 VALUES (19,NULL,NULL), (20,'r','r');
|
|
CREATE TABLE t1 (a int, b varchar(1) , c varchar(1));
|
|
INSERT INTO t1 VALUES (1,NULL,NULL), (5,'r','r'), (7,'y','y');
|
|
CREATE TABLE t2 (a int NOT NULL , b int, c varchar(1));
|
|
INSERT INTO t2 VALUES (4,3,'r');
|
|
CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
|
|
SET SESSION optimizer_switch='derived_with_keys=off';
|
|
EXPLAIN
|
|
SELECT * FROM t3
|
|
WHERE t3.b IN (SELECT v1.b FROM v1, t2
|
|
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where
|
|
2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1
|
|
2 DEPENDENT SUBQUERY <derived3> ALL NULL NULL NULL NULL 3 Using where
|
|
3 DERIVED t1 ALL NULL NULL NULL NULL 3
|
|
SELECT * FROM t3
|
|
WHERE t3.b IN (SELECT v1.b FROM v1, t2
|
|
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
|
|
a b c
|
|
20 r r
|
|
SET SESSION optimizer_switch='derived_with_keys=on';
|
|
EXPLAIN
|
|
SELECT * FROM t3
|
|
WHERE t3.b IN (SELECT v1.b FROM v1, t2
|
|
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where
|
|
2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1
|
|
2 DEPENDENT SUBQUERY <derived3> ref key1 key1 10 const,const 0 Using where
|
|
3 DERIVED t1 ALL NULL NULL NULL NULL 3
|
|
SELECT * FROM t3
|
|
WHERE t3.b IN (SELECT v1.b FROM v1, t2
|
|
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
|
|
a b c
|
|
20 r r
|
|
DROP VIEW v1;
|
|
DROP TABLE t1,t2,t3;
|
|
#
|
|
# LP bug #873263: materialized view used in correlated IN subquery
|
|
#
|
|
CREATE TABLE t1 (a int, b int) ;
|
|
INSERT INTO t1 VALUES (5,4), (9,8);
|
|
CREATE TABLE t2 (a int, b int) ;
|
|
INSERT INTO t2 VALUES (4,5), (5,1);
|
|
CREATE ALGORITHM=TEMPTABLE VIEW v2 AS SELECT * FROM t2;
|
|
SET SESSION optimizer_switch='derived_with_keys=on';
|
|
EXPLAIN
|
|
SELECT * FROM t1 WHERE t1.b IN (SELECT v2.a FROM v2 WHERE v2.b = t1.a);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
|
|
2 DEPENDENT SUBQUERY <derived3> ref key0 key0 5 test.t1.a 2 Using where
|
|
3 DERIVED t2 ALL NULL NULL NULL NULL 2
|
|
SELECT * FROM t1 WHERE t1.b IN (SELECT v2.a FROM v2 WHERE v2.b = t1.a);
|
|
a b
|
|
5 4
|
|
DROP VIEW v2;
|
|
DROP TABLE t1,t2;
|
|
set optimizer_switch= @tmp_subselect_extra_derived;
|
|
set optimizer_switch= @subselect_extra_no_sj_tmp;
|
|
set @optimizer_switch_for_subselect_extra_test=null;
|