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Backport of subquery optimizations to 5.3.

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There are still test failures because of:
- Wrong query results in outer join + semi join
- EXPLAIN output differences
This commit is contained in:
Sergey Petrunya
2010-01-17 17:51:10 +03:00
parent 1a490f2da4
commit b83cb52e9e
57 changed files with 30727 additions and 504 deletions
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62
mysql-test/r/subselect.result
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@@ -1323,6 +1323,10 @@ create table t1 (a int, b int, index a (a,b));
create table t2 (a int, index a (a));
create table t3 (a int, b int, index a (a));
insert into t1 values (1,10), (2,20), (3,30), (4,40);
create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
insert into t1
select rand()*100000+200,rand()*100000 from t0 A, t0 B, t0 C, t0 D;
insert into t2 values (2), (3), (4), (5);
insert into t3 values (10,3), (20,4), (30,5);
select * from t2 where t2.a in (select a from t1);
@@ -3554,28 +3558,6 @@ ORDER BY t1.t DESC LIMIT 1);
i1 i2 t i1 i2 t
24 1 2005-05-27 12:40:30 24 1 2006-06-20 12:29:40
DROP TABLE t1, t2;
CREATE TABLE t1 (i INT);
(SELECT i FROM t1) UNION (SELECT i FROM t1);
i
SELECT sql_no_cache * FROM t1 WHERE NOT EXISTS
(
(SELECT i FROM t1) UNION
(SELECT i FROM t1)
);
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION
(SELECT i FROM t1)
)' at line 3
SELECT * FROM t1
WHERE NOT EXISTS (((SELECT i FROM t1) UNION (SELECT i FROM t1)));
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION (SELECT i FROM t1)))' at line 2
explain select ((select t11.i from t1 t11) union (select t12.i from t1 t12))
from t1;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'union (select t12.i from t1 t12))
from t1' at line 1
explain select * from t1 where not exists
((select t11.i from t1 t11) union (select t12.i from t1 t12));
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'union (select t12.i from t1 t12))' at line 2
DROP TABLE t1;
CREATE TABLE t1 (a VARCHAR(250), b INT auto_increment, PRIMARY KEY (b));
insert into t1 (a) values (FLOOR(rand() * 100));
insert into t1 (a) select FLOOR(rand() * 100) from t1;
@@ -3666,6 +3648,11 @@ DROP TABLE t1,t2;
CREATE TABLE t1 (a int, b int auto_increment, PRIMARY KEY (b));
CREATE TABLE t2 (x int auto_increment, y int, z int,
PRIMARY KEY (x), FOREIGN KEY (y) REFERENCES t1 (b));
create table t3 (a int);
insert into t3 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
insert into t1 select RAND()*1000, A.a + 10*(B.a+10*(C.a+10*D.a))
from t3 A, t3 B, t3 C, t3 D where D.a<3;
insert into t2(y,z) select t1.b, RAND()*1000 from t1, t3;
SET SESSION sort_buffer_size = 32 * 1024;
Warnings:
Warning 1292 Truncated incorrect sort_buffer_size value: '32768'
@@ -3680,7 +3667,7 @@ FROM (SELECT a, b, (SELECT x FROM t2 WHERE y=b ORDER BY z DESC LIMIT 1) c
FROM t1) t;
COUNT(*)
3000
DROP TABLE t1,t2;
DROP TABLE t1,t2,t3;
CREATE TABLE t1 (id char(4) PRIMARY KEY, c int);
CREATE TABLE t2 (c int);
INSERT INTO t1 VALUES ('aa', 1);
@@ -4260,37 +4247,20 @@ out_a MIN(b)
1 2
2 4
DROP TABLE t1;
CREATE TABLE t1 (a INT);
CREATE TABLE t2 (a INT);
INSERT INTO t1 VALUES (1),(2);
INSERT INTO t2 VALUES (1),(2);
SELECT 2 FROM t1 WHERE EXISTS ((SELECT 1 FROM t2 WHERE t1.a=t2.a));
2
2
2
EXPLAIN EXTENDED
SELECT 2 FROM t1 WHERE EXISTS ((SELECT 1 FROM t2 WHERE t1.a=t2.a));
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 t2 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1276 Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
Note 1003 select 2 AS `2` from `test`.`t1` where exists(select 1 AS `1` from `test`.`t2` where (`test`.`t1`.`a` = `test`.`t2`.`a`))
EXPLAIN EXTENDED
SELECT 2 FROM t1 WHERE EXISTS ((SELECT 1 FROM t2 WHERE t1.a=t2.a) UNION
(SELECT 1 FROM t2 WHERE t1.a = t2.a));
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION
(SELECT 1 FROM t2 WHERE t1.a = t2.a))' at line 2
DROP TABLE t1,t2;
create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1(f11 int, f12 int);
create table t2(f21 int unsigned not null, f22 int, f23 varchar(10));
insert into t1 values(1,1),(2,2), (3, 3);
insert into t2
select -1 , (@a:=(A.a + 10 * (B.a + 10 * (C.a+10*D.a))))/5000 + 1, @a
from t0 A, t0 B, t0 C, t0 D;
set session sort_buffer_size= 33*1024;
select count(*) from t1 where f12 =
(select f22 from t2 where f22 = f12 order by f21 desc, f22, f23 limit 1);
count(*)
3
drop table t1,t2;
drop table t0,t1,t2;
CREATE TABLE t4 (
f7 varchar(32) collate utf8_bin NOT NULL default '',
f10 varchar(32) collate utf8_bin default NULL,