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Commit 9426530d authored by Igor Babaev's avatar Igor Babaev
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Merge.

parents 7c7611d7 250bc599
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mysql-test/r/subselect_extra_no_semijoin.result
View file @ 9426530d
set @subselect_extra_no_sj_tmp=@@optimizer_switch; set @subselect_extra_no_sj_tmp=@@optimizer_switch;
set optimizer_switch='semijoin=on,firstmatch=on,loosescan=on'; set optimizer_switch='semijoin=off,firstmatch=off,loosescan=off';
drop table if exists t1,t2,t3,t4; drop table if exists t1,t2,t3,t4;
drop view if exists v1,v2,v3; drop view if exists v1,v2,v3;
# From explain.test: # From explain.test:
...@@ -14,16 +14,16 @@ insert into t2 values ('2001-01-01 1:1:1'), ('2001-01-01 1:1:1'); ...@@ -14,16 +14,16 @@ insert into t2 values ('2001-01-01 1:1:1'), ('2001-01-01 1:1:1');
flush tables; 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 ); 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 id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY OUTR ALL NULL NULL NULL NULL 2 Using where; Start temporary 1 PRIMARY OUTR ALL NULL NULL NULL NULL 2 Using where
1 PRIMARY INNR ALL NULL NULL NULL NULL 2 Using where; End temporary; Using join buffer (flat, BNL join) 2 DEPENDENT SUBQUERY INNR ALL NULL NULL NULL NULL 2 Using where
flush tables; 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 ); SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL );
dt dt
flush tables; 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' ); 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 id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY OUTR ALL NULL NULL NULL NULL 2 Using where; Start temporary 1 PRIMARY OUTR ALL NULL NULL NULL NULL 2 Using where
1 PRIMARY INNR ALL NULL NULL NULL NULL 2 Using where; End temporary; Using join buffer (flat, BNL join) 2 DEPENDENT SUBQUERY INNR ALL NULL NULL NULL NULL 2 Using where
flush tables; 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' ); 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 dt
...@@ -42,10 +42,11 @@ explain extended ...@@ -42,10 +42,11 @@ explain extended
select * from t1 select * from t1
where id in (select id from t1 as x1 where (t1.cur_date is null)); 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 id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
Warnings: Warnings:
Note 1276 Field or reference 'test.t1.cur_date' of SELECT #2 was resolved in SELECT #1 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 `test`.`t1` semi join (`test`.`t1` `x1`) where (('2007-04-25 18:30:22' = 0)) Note 1003 select 1 AS `id`,'2007-04-25 18:30:22' AS `cur_date` from `test`.`t1` where <expr_cache><1>(<in_optimizer>(1,<exists>(select `test`.`x1`.`id` from `test`.`t1` `x1` where 0)))
select * from t1 select * from t1
where id in (select id from t1 as x1 where (t1.cur_date is null)); where id in (select id from t1 as x1 where (t1.cur_date is null));
id cur_date id cur_date
...@@ -53,10 +54,11 @@ explain extended ...@@ -53,10 +54,11 @@ explain extended
select * from t2 select * from t2
where id in (select id from t2 as x1 where (t2.cur_date is null)); 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 id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 1 PRIMARY t2 system NULL NULL NULL NULL 1 100.00
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
Warnings: Warnings:
Note 1276 Field or reference 'test.t2.cur_date' of SELECT #2 was resolved in SELECT #1 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 `test`.`t2` semi join (`test`.`t2` `x1`) where (('2007-04-25' = 0)) Note 1003 select 1 AS `id`,'2007-04-25' AS `cur_date` from `test`.`t2` where <expr_cache><1>(<in_optimizer>(1,<exists>(select `test`.`x1`.`id` from `test`.`t2` `x1` where 0)))
select * from t2 select * from t2
where id in (select id from t2 as x1 where (t2.cur_date is null)); where id in (select id from t2 as x1 where (t2.cur_date is null));
id cur_date id cur_date
...@@ -66,11 +68,11 @@ explain extended ...@@ -66,11 +68,11 @@ explain extended
select * from t1 select * from t1
where id in (select id from t1 as x1 where (t1.cur_date is null)); 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 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; Start temporary 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 Using where
1 PRIMARY x1 ALL NULL NULL NULL NULL 2 100.00 Using where; End temporary; Using join buffer (flat, BNL join) 2 DEPENDENT SUBQUERY x1 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings: Warnings:
Note 1276 Field or reference 'test.t1.cur_date' of SELECT #2 was resolved in SELECT #1 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` semi join (`test`.`t1` `x1`) where ((`test`.`x1`.`id` = `test`.`t1`.`id`) and (`test`.`t1`.`cur_date` = 0)) 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 select * from t1
where id in (select id from t1 as x1 where (t1.cur_date is null)); where id in (select id from t1 as x1 where (t1.cur_date is null));
id cur_date id cur_date
...@@ -78,11 +80,11 @@ explain extended ...@@ -78,11 +80,11 @@ explain extended
select * from t2 select * from t2
where id in (select id from t2 as x1 where (t2.cur_date is null)); 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 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; Start temporary 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
1 PRIMARY x1 ALL NULL NULL NULL NULL 2 100.00 Using where; End temporary; Using join buffer (flat, BNL join) 2 DEPENDENT SUBQUERY x1 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings: Warnings:
Note 1276 Field or reference 'test.t2.cur_date' of SELECT #2 was resolved in SELECT #1 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` semi join (`test`.`t2` `x1`) where ((`test`.`x1`.`id` = `test`.`t2`.`id`) and (`test`.`t2`.`cur_date` = 0)) 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 select * from t2
where id in (select id from t2 as x1 where (t2.cur_date is null)); where id in (select id from t2 as x1 where (t2.cur_date is null));
id cur_date id cur_date
...@@ -228,7 +230,7 @@ group by a1,a2,b; ...@@ -228,7 +230,7 @@ group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra 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 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 2 DEPENDENT SUBQUERY t2 index NULL idx_t2_1 163 NULL 164 Using where; Using index
2 DEPENDENT SUBQUERY t3 index NULL idx_t3_1 10 NULL 192 Using where; Using index; FirstMatch(t2) 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 select a1,a2,b,c,min(c), max(c) from t1
where exists ( select * from t2 where exists ( select * from t2
where t2.c in (select c from t3 where t3.c > t1.b) and where t2.c in (select c from t3 where t3.c > t1.b) and
...@@ -259,7 +261,7 @@ group by a1,a2,b; ...@@ -259,7 +261,7 @@ group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra 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 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 2 DEPENDENT SUBQUERY t2 index NULL idx_t2_1 163 NULL 164 Using where; Using index
2 DEPENDENT SUBQUERY t3 index NULL idx_t3_1 10 NULL 192 Using where; Using index; FirstMatch(t2) 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 select a1,a2,b,c,min(c), max(c) from t1
where exists ( select * from t2 where exists ( select * from t2
where t2.c in (select c from t3 where t3.c > t1.c) and where t2.c in (select c from t3 where t3.c > t1.c) and
...@@ -305,8 +307,8 @@ test.t1 analyze status OK ...@@ -305,8 +307,8 @@ test.t1 analyze status OK
EXPLAIN SELECT 1 FROM t1 WHERE a IN EXPLAIN SELECT 1 FROM t1 WHERE a IN
(SELECT a FROM t1 USE INDEX (i2) IGNORE INDEX (i2)); (SELECT a FROM t1 USE INDEX (i2) IGNORE INDEX (i2));
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index PRIMARY,i2 PRIMARY 4 NULL 144 Using index 1 PRIMARY t1 index NULL PRIMARY 4 NULL 144 Using where; Using index
1 PRIMARY t1 ALL NULL NULL NULL NULL 144 Using where; FirstMatch(t1) 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 144 Using where
CREATE TABLE t2 (a INT, b INT, KEY(a)); CREATE TABLE t2 (a INT, b INT, KEY(a));
INSERT INTO t2 VALUES (1, 1), (2, 2), (3,3), (4,4); INSERT INTO t2 VALUES (1, 1), (2, 2), (3,3), (4,4);
EXPLAIN SELECT a, SUM(b) FROM t2 GROUP BY a LIMIT 2; EXPLAIN SELECT a, SUM(b) FROM t2 GROUP BY a LIMIT 2;
...@@ -318,8 +320,8 @@ id select_type table type possible_keys key key_len ref rows Extra ...@@ -318,8 +320,8 @@ id select_type table type possible_keys key key_len ref rows Extra
EXPLAIN SELECT 1 FROM t2 WHERE a IN EXPLAIN SELECT 1 FROM t2 WHERE a IN
(SELECT a FROM t1 USE INDEX (i2) IGNORE INDEX (i2)); (SELECT a FROM t1 USE INDEX (i2) IGNORE INDEX (i2));
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 index a a 5 NULL 4 Using index 1 PRIMARY t2 index NULL a 5 NULL 4 Using where; Using index
1 PRIMARY t1 ALL NULL NULL NULL NULL 144 Using where; FirstMatch(t2) 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 144 Using where
DROP TABLE t1, t2; DROP TABLE t1, t2;
# #
# From derived_view.test # From derived_view.test
...@@ -343,10 +345,10 @@ SELECT * FROM t2 RIGHT JOIN (SELECT * FROM t1) AS t ON t.a != 0 ...@@ -343,10 +345,10 @@ SELECT * FROM t2 RIGHT JOIN (SELECT * FROM t1) AS t ON t.a != 0
WHERE t.a IN (SELECT b FROM t1); WHERE t.a IN (SELECT b FROM t1);
id select_type table type possible_keys key key_len ref rows filtered Extra 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 t1 system NULL NULL NULL NULL 1 100.00
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
3 DEPENDENT SUBQUERY t1 system NULL NULL NULL NULL 1 100.00
Warnings: Warnings:
Note 1003 select `test`.`t2`.`a` AS `a`,0 AS `a`,0 AS `b` from `test`.`t1` semi join (`test`.`t1`) left join `test`.`t2` on((0 <> 0)) where 1 Note 1003 select `test`.`t2`.`a` AS `a`,0 AS `a`,0 AS `b` from `test`.`t1` left join `test`.`t2` on((0 <> 0)) where <expr_cache><0>(<in_optimizer>(0,<exists>(select 0 from `test`.`t1` where (<cache>(0) = 0))))
SELECT * FROM t2 RIGHT JOIN v1 AS t ON t.a != 0 SELECT * FROM t2 RIGHT JOIN v1 AS t ON t.a != 0
WHERE t.a IN (SELECT b FROM t1); WHERE t.a IN (SELECT b FROM t1);
a a b a a b
...@@ -356,10 +358,10 @@ SELECT * FROM t2 RIGHT JOIN v1 AS t ON t.a != 0 ...@@ -356,10 +358,10 @@ SELECT * FROM t2 RIGHT JOIN v1 AS t ON t.a != 0
WHERE t.a IN (SELECT b FROM t1); WHERE t.a IN (SELECT b FROM t1);
id select_type table type possible_keys key key_len ref rows filtered Extra 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 t1 system NULL NULL NULL NULL 1 100.00
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
2 DEPENDENT SUBQUERY t1 system NULL NULL NULL NULL 1 100.00
Warnings: Warnings:
Note 1003 select `test`.`t2`.`a` AS `a`,0 AS `a`,0 AS `b` from `test`.`t1` semi join (`test`.`t1`) left join `test`.`t2` on((0 <> 0)) where 1 Note 1003 select `test`.`t2`.`a` AS `a`,0 AS `a`,0 AS `b` from `test`.`t1` left join `test`.`t2` on((0 <> 0)) where <expr_cache><0>(<in_optimizer>(0,<exists>(select 0 from `test`.`t1` where (<cache>(0) = 0))))
DROP VIEW v1; DROP VIEW v1;
DROP TABLE t1,t2; DROP TABLE t1,t2;
# #
...@@ -386,7 +388,7 @@ EXPLAIN ...@@ -386,7 +388,7 @@ EXPLAIN
SELECT a FROM t1 WHERE (a,b) IN (SELECT * FROM v1); SELECT a FROM t1 WHERE (a,b) IN (SELECT * FROM v1);
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
1 PRIMARY <derived3> ref key0 key0 10 test.t1.a,test.t1.b 2 FirstMatch(t1) 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 3 DERIVED t2 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort
SELECT * FROM v2; SELECT * FROM v2;
a b a b
...@@ -406,7 +408,7 @@ EXPLAIN ...@@ -406,7 +408,7 @@ EXPLAIN
SELECT a FROM t1 WHERE (a,b) IN (SELECT * FROM v2); SELECT a FROM t1 WHERE (a,b) IN (SELECT * FROM v2);
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
1 PRIMARY <derived3> ref key0 key0 10 test.t1.a,test.t1.b 2 FirstMatch(t1) 2 DEPENDENT SUBQUERY <derived3> index_subquery key0 key0 10 func,func 2 Using where
3 DERIVED t2 ALL NULL NULL NULL NULL 6 3 DERIVED t2 ALL NULL NULL NULL NULL 6
4 UNION t3 ALL NULL NULL NULL NULL 4 4 UNION t3 ALL NULL NULL NULL NULL 4
NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
...@@ -428,9 +430,9 @@ SELECT * FROM t3 ...@@ -428,9 +430,9 @@ SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2 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); 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 id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1 1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where
1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where; Start temporary 2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1
1 PRIMARY <derived3> ALL NULL NULL NULL NULL 3 Using where; End temporary; Using join buffer (flat, BNL join) 2 DEPENDENT SUBQUERY <derived3> ALL NULL NULL NULL NULL 3 Using where
3 DERIVED t1 ALL NULL NULL NULL NULL 3 3 DERIVED t1 ALL NULL NULL NULL NULL 3
SELECT * FROM t3 SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2 WHERE t3.b IN (SELECT v1.b FROM v1, t2
...@@ -443,9 +445,9 @@ SELECT * FROM t3 ...@@ -443,9 +445,9 @@ SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2 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); 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 id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1 1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where
1 PRIMARY <derived3> ref key1 key1 10 const,const 0 Start temporary 2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1
1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where; End temporary; Using join buffer (flat, BNL join) 2 DEPENDENT SUBQUERY <derived3> ref key1 key1 10 const,const 0 Using where
3 DERIVED t1 ALL NULL NULL NULL NULL 3 3 DERIVED t1 ALL NULL NULL NULL NULL 3
SELECT * FROM t3 SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2 WHERE t3.b IN (SELECT v1.b FROM v1, t2
...@@ -467,7 +469,7 @@ EXPLAIN ...@@ -467,7 +469,7 @@ EXPLAIN
SELECT * FROM t1 WHERE t1.b IN (SELECT v2.a FROM v2 WHERE v2.b = t1.a); 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 id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
1 PRIMARY <derived3> ref key0 key0 10 test.t1.b,test.t1.a 2 FirstMatch(t1) 2 DEPENDENT SUBQUERY <derived3> ref key0 key0 5 test.t1.a 2 Using where
3 DERIVED t2 ALL NULL NULL NULL NULL 2 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); SELECT * FROM t1 WHERE t1.b IN (SELECT v2.a FROM v2 WHERE v2.b = t1.a);
a b a b
......
mysql-test/t/subselect_extra_no_semijoin.test
View file @ 9426530d
set @subselect_extra_no_sj_tmp=@@optimizer_switch; set @subselect_extra_no_sj_tmp=@@optimizer_switch;
set optimizer_switch='semijoin=on,firstmatch=on,loosescan=on'; set optimizer_switch='semijoin=off,firstmatch=off,loosescan=off';
--source t/subselect_extra.test --source t/subselect_extra.test
......
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