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Fixed bug #28189: in some rare cases optimizer preferred a more expensive

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ref access to a less expensive range access. 
This occurred only with InnoDB tables.


mysql-test/r/innodb_mysql.result:
  Added a test case for bug #28189.
mysql-test/t/innodb_mysql.test:
  Added a test case for bug #28189.
This commit is contained in:
unknown
2007-05-10 00:06:24 -07:00
parent ba9657bcc6
commit 184cc3b5fa
3 changed files with 107 additions and 1 deletions
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54
mysql-test/t/innodb_mysql.test
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@@ -518,4 +518,58 @@ select * from t1;
drop table t1;
#
# Bug #28189: optimizer erroniously prefers ref access to range access
# for an InnoDB table
#
CREATE TABLE t1(
id int AUTO_INCREMENT PRIMARY KEY,
stat_id int NOT NULL,
acct_id int DEFAULT NULL,
INDEX idx1 (stat_id, acct_id),
INDEX idx2 (acct_id)
) ENGINE=MyISAM;
CREATE TABLE t2(
id int AUTO_INCREMENT PRIMARY KEY,
stat_id int NOT NULL,
acct_id int DEFAULT NULL,
INDEX idx1 (stat_id, acct_id),
INDEX idx2 (acct_id)
) ENGINE=InnoDB;
INSERT INTO t1(stat_id,acct_id) VALUES
(1,759), (2,831), (3,785), (4,854), (1,921),
(1,553), (2,589), (3,743), (2,827), (2,545),
(4,779), (4,783), (1,597), (1,785), (4,832),
(1,741), (1,833), (3,788), (2,973), (1,907);
INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1;
INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1;
INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1;
INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1;
INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1;
INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1;
INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1;
INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1;
INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1;
INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1;
INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1;
UPDATE t1 SET acct_id=785
WHERE MOD(stat_id,2)=0 AND MOD(id,stat_id)=MOD(acct_id,stat_id);
OPTIMIZE TABLE t1;
SELECT COUNT(*) FROM t1;
SELECT COUNT(*) FROM t1 WHERE acct_id=785;
EXPLAIN SELECT COUNT(*) FROM t1 WHERE stat_id IN (1,3) AND acct_id=785;
INSERT INTO t2 SELECT * FROM t1;
OPTIMIZE TABLE t2;
EXPLAIN SELECT COUNT(*) FROM t2 WHERE stat_id IN (1,3) AND acct_id=785;
DROP TABLE t1,t2;
--echo End of 5.0 tests