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BUG#901399: Wrong result (extra row) with semijoin=ON, materialization=OFF, optimizer_prune_level=0

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- Correctly handle plan refinement stage for LooseScan plans: run create_ref_for_key() if LooseScan 
  plan includes a ref access, and if we don't have any fixed key components, switch to a full index scan.
This commit is contained in:
Sergey Petrunya
2011-12-16 03:44:25 +04:00
parent 464278246a
commit 04e9004fa3
7 changed files with 121 additions and 14 deletions
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4
mysql-test/r/subselect3.result
View File

@ -1274,11 +1274,11 @@ insert into t1 select A.a, B.a, 'filler' from t0 A, t0 B;
create table t2 as select * from t1;
explain select * from t2 where a in (select b from t1 where a=3);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 range a a 5 NULL 8 Using where; Using index; LooseScan
1 PRIMARY t1 ref a a 5 const 8 Using index; LooseScan
1 PRIMARY t2 ALL NULL NULL NULL NULL 100 Using where; Using join buffer (flat, BNL join)
explain select * from t2 where (b,a) in (select a,b from t1 where a=3);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 range a a 5 NULL 8 Using where; Using index; LooseScan
1 PRIMARY t1 ref a a 5 const 8 Using index; LooseScan
1 PRIMARY t2 ALL NULL NULL NULL NULL 100 Using where; Using join buffer (flat, BNL join)
drop table t1,t2;
set @@optimizer_switch=@save_optimizer_switch;

4
mysql-test/r/subselect3_jcl6.result
View File

@ -1283,11 +1283,11 @@ insert into t1 select A.a, B.a, 'filler' from t0 A, t0 B;
create table t2 as select * from t1;
explain select * from t2 where a in (select b from t1 where a=3);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 range a a 5 NULL 8 Using where; Using index; LooseScan
1 PRIMARY t1 ref a a 5 const 8 Using index; LooseScan
1 PRIMARY t2 ALL NULL NULL NULL NULL 100 Using where; Using join buffer (flat, BNL join)
explain select * from t2 where (b,a) in (select a,b from t1 where a=3);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 range a a 5 NULL 8 Using where; Using index; LooseScan
1 PRIMARY t1 ref a a 5 const 8 Using index; LooseScan
1 PRIMARY t2 ALL NULL NULL NULL NULL 100 Using where; Using join buffer (flat, BNL join)
drop table t1,t2;
set @@optimizer_switch=@save_optimizer_switch;

27
mysql-test/r/subselect_sj.result
View File

@ -2149,4 +2149,31 @@ a a
SET optimizer_prune_level=DEFAULT;
SET optimizer_switch=@tmp_optimizer_switch;
DROP TABLE t1,t2,t3,t4;
#
# BUG#901399: Wrong result (extra row) with semijoin=ON, materialization=OFF, optimizer_prune_level=0
#
set @opl_901399= @@optimizer_prune_level;
set @os_091399= @@optimizer_switch;
SET optimizer_prune_level=0;
SET optimizer_switch = 'materialization=off';
CREATE TABLE t1 ( c INT ) ENGINE=MyISAM;
INSERT INTO t1 VALUES
(0),(1),(2),(3),(4),(5),
(6),(7),(8),(9),(10),(11),(12);
CREATE TABLE t2 ( a INT, b INT, KEY(a)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (3,20),(2,21),(3,22);
SELECT *
FROM t1 AS alias1, t1 AS alias2
WHERE ( alias1.c, alias2.c )
IN (
SELECT alias3.a, alias3.a
FROM t2 AS alias3, t2 alias4
WHERE alias3.b = alias4.b
);
c c
2 2
3 3
set optimizer_prune_level= @opl_901399;
set optimizer_switch= @os_091399;
DROP TABLE t1,t2;
set optimizer_switch=@subselect_sj_tmp;

27
mysql-test/r/subselect_sj_jcl6.result
View File

@ -2155,6 +2155,33 @@ a a
SET optimizer_prune_level=DEFAULT;
SET optimizer_switch=@tmp_optimizer_switch;
DROP TABLE t1,t2,t3,t4;
#
# BUG#901399: Wrong result (extra row) with semijoin=ON, materialization=OFF, optimizer_prune_level=0
#
set @opl_901399= @@optimizer_prune_level;
set @os_091399= @@optimizer_switch;
SET optimizer_prune_level=0;
SET optimizer_switch = 'materialization=off';
CREATE TABLE t1 ( c INT ) ENGINE=MyISAM;
INSERT INTO t1 VALUES
(0),(1),(2),(3),(4),(5),
(6),(7),(8),(9),(10),(11),(12);
CREATE TABLE t2 ( a INT, b INT, KEY(a)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (3,20),(2,21),(3,22);
SELECT *
FROM t1 AS alias1, t1 AS alias2
WHERE ( alias1.c, alias2.c )
IN (
SELECT alias3.a, alias3.a
FROM t2 AS alias3, t2 alias4
WHERE alias3.b = alias4.b
);
c c
2 2
3 3
set optimizer_prune_level= @opl_901399;
set optimizer_switch= @os_091399;
DROP TABLE t1,t2;
set optimizer_switch=@subselect_sj_tmp;
#
# BUG#49129: Wrong result with IN-subquery with join_cache_level=6 and firstmatch=off

29
mysql-test/t/subselect_sj.test
View File

@ -1967,5 +1967,34 @@ SET optimizer_switch=@tmp_optimizer_switch;
DROP TABLE t1,t2,t3,t4;
--echo #
--echo # BUG#901399: Wrong result (extra row) with semijoin=ON, materialization=OFF, optimizer_prune_level=0
--echo #
set @opl_901399= @@optimizer_prune_level;
set @os_091399= @@optimizer_switch;
SET optimizer_prune_level=0;
SET optimizer_switch = 'materialization=off';
CREATE TABLE t1 ( c INT ) ENGINE=MyISAM;
INSERT INTO t1 VALUES
(0),(1),(2),(3),(4),(5),
(6),(7),(8),(9),(10),(11),(12);
CREATE TABLE t2 ( a INT, b INT, KEY(a)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (3,20),(2,21),(3,22);
SELECT *
FROM t1 AS alias1, t1 AS alias2
WHERE ( alias1.c, alias2.c )
IN (
SELECT alias3.a, alias3.a
FROM t2 AS alias3, t2 alias4
WHERE alias3.b = alias4.b
);
set optimizer_prune_level= @opl_901399;
set optimizer_switch= @os_091399;
DROP TABLE t1,t2;
# The following command must be the last one the file
set optimizer_switch=@subselect_sj_tmp;