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BUG#20357 - Got error 124 from storage engine using MIN and MAX

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functions in queries

Using MAX()/MIN() on table with disabled indexes (by ALTER TABLE)
results in error 124 (wrong index) from storage engine.

The problem was that optimizer use disabled index to optimize
MAX()/MIN(). Normally it must skip disabled index and perform
table scan.

This patch skips disabled indexes for min/max optimization.


mysql-test/r/myisam.result:
  Test case for BUG#20357.
mysql-test/t/myisam.test:
  Test case for BUG#20357.
sql/opt_sum.cc:
  Skip disabled/ignored indexes for min/max optimization.
This commit is contained in:
unknown
2006-06-21 17:30:59 +05:00
parent ef02d496a0
commit 5c0cdea623
3 changed files with 31 additions and 0 deletions
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13
mysql-test/r/myisam.result
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@ -748,3 +748,16 @@ select count(id1) from t1 where id2 = 10;
count(id1)
5
drop table t1;
CREATE TABLE t1(a TINYINT, KEY(a)) ENGINE=MyISAM;
INSERT INTO t1 VALUES(1);
SELECT MAX(a) FROM t1 IGNORE INDEX(a);
MAX(a)
1
ALTER TABLE t1 DISABLE KEYS;
SELECT MAX(a) FROM t1;
MAX(a)
1
SELECT MAX(a) FROM t1 IGNORE INDEX(a);
MAX(a)
1
DROP TABLE t1;