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Merge host.loc:/work/bugs/5.1-bugteam-36006

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into  host.loc:/work/bk/5.1-bugteam
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2008-04-28 08:29:58 +05:00
parent 92098d5d66 5b8cdbf4a6
commit 5141601a97
8 changed files with 70 additions and 2 deletions
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16
mysql-test/t/merge.test
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@ -1394,3 +1394,19 @@ FLUSH TABLES m1, t1;
UNLOCK TABLES;
DROP TABLE t1, m1;
#
# Bug#36006 - Optimizer does table scan for select count(*)
#
CREATE TABLE t1(C1 INT, C2 INT, KEY C1(C1), KEY C2(C2)) ENGINE=MYISAM;
CREATE TABLE t2(C1 INT, C2 INT, KEY C1(C1), KEY C2(C2)) ENGINE=MYISAM;
CREATE TABLE t3(C1 INT, C2 INT, KEY C1(C1), KEY C2(C2)) ENGINE=MYISAM;
CREATE TABLE t4(C1 INT, C2 INT, KEY C1(C1), KEY C2(C2))
ENGINE=MRG_MYISAM UNION=(t1, t2, t3);
INSERT INTO t1 VALUES (1,1), (1,2),(1,3), (1,4);
INSERT INTO t2 VALUES (2,1), (2,2),(2,3), (2,4);
INSERT INTO t3 VALUES (3,1), (3,2),(3,3), (3,4);
EXPLAIN SELECT COUNT(*) FROM t1;
EXPLAIN SELECT COUNT(*) FROM t4;
DROP TABLE t1, t2, t3, t4;
--echo End of 5.1 tests