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BUG#858732: Wrong result with semijoin + loosescan + comma join

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- Fix wrong loop bounds in setup_semijoin_dups_elimination()
This commit is contained in:
Sergey Petrunya 2011-09-26 13:56:09 +04:00
commit 4908d27b57
5 changed files with 93 additions and 1 deletions
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23
mysql-test/r/subselect_sj2.result
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@ -764,4 +764,27 @@ a b c
1 r r
DROP VIEW v1;
DROP TABLE t1, t2;
#
# BUG#858732: Wrong result with semijoin + loosescan + comma join
#
CREATE TABLE t1 (f13 int(11) NOT NULL , PRIMARY KEY (f13)) ENGINE=InnoDB;
INSERT INTO t1 VALUES (16),(24);
CREATE TABLE t2 (f14 int(11) NOT NULL, f12 varchar(1) NOT NULL, KEY (f12,f14)) ENGINE=InnoDB;
INSERT INTO t2 VALUES (6,'y');
CREATE TABLE t3 (f12 varchar(1) NOT NULL) ENGINE=InnoDB;
INSERT INTO t3 VALUES ('r'),('s'),('t'),('v'),('w'),('x'),('y');
# The following must use LooseScan but not join buffering
explain
SELECT * FROM t3
WHERE f12 IN (SELECT alias2.f12 FROM t1 AS alias1, t2 AS alias2, t1 WHERE alias1.f13 = 24);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias1 const PRIMARY PRIMARY 4 const 1 Using index
1 PRIMARY alias2 index f12 f12 7 NULL 1 Using index; LooseScan
1 PRIMARY t1 index NULL PRIMARY 4 NULL 2 Using index; FirstMatch(alias2)
1 PRIMARY t3 ALL NULL NULL NULL NULL 7 Using where; Using join buffer (flat, BNL join)
SELECT * FROM t3
WHERE f12 IN (SELECT alias2.f12 FROM t1 AS alias1, t2 AS alias2, t1 WHERE alias1.f13 = 24);
f12
y
DROP TABLE t1,t2,t3;
set optimizer_switch=@subselect_sj2_tmp;