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Merge.

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This commit is contained in:
Igor Babaev
2011-10-14 00:11:50 -07:00
parent 9f6e24a05a 9e6f484788
commit 54e296d4a7
4 changed files with 91 additions and 0 deletions
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38
mysql-test/r/derived_view.result
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@@ -1424,4 +1424,42 @@ a a c a a c b a d
6 23 -1 NULL NULL NULL NULL NULL 5
DROP VIEW v2,v3;
DROP TABLE t1,t2,t3,t4,t5;
#
# LP bug #872735: derived used in a NOT IN subquery
#
CREATE TABLE t1 (b int NOT NULL);
INSERT INTO t1 VALUES (9), (7);
CREATE TABLE t2 (a int NOT NULL) ;
INSERT INTO t2 VALUES (1), (2);
CREATE TABLE t3 (
a int NOT NULL , c int NOT NULL, d varchar(1) NOT NULL,
KEY (c,a) , PRIMARY KEY (a)
);
INSERT INTO t3 VALUES
(14,4,'a'), (15,7,'b'), (16,4,'c'), (17,1,'d'), (18,9,'e'),
(19,4,'f'), (20,8,'g');
SET SESSION optimizer_switch='derived_merge=on,subquery_cache=off';
# The following two EXPLAINs must return the same execution plan
EXPLAIN
SELECT * FROM t1 , t2
WHERE (t2.a ,t1.b) NOT IN (SELECT DISTINCT c,a FROM t3 t);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY t ref PRIMARY,c c 4 func 2 Using where; Using index
EXPLAIN
SELECT * FROM t1 , t2
WHERE (t2.a ,t1.b) NOT IN (SELECT DISTINCT c,a FROM (SELECT * FROM t3) t);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY t3 ref PRIMARY,c c 4 func 2 Using where; Using index
SELECT * FROM t1 , t2
WHERE (t2.a ,t1.b) NOT IN (SELECT DISTINCT c,a FROM (SELECT * FROM t3) t);
b a
9 1
7 1
9 2
7 2
DROP TABLE t1,t2,t3;
set optimizer_switch=@exit_optimizer_switch;