database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-09-02 09:41:40 +03:00
Code Activity

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

Browse Source 
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.
This commit is contained in:
svoj@may.pils.ru
2006-06-21 17:30:59 +05:00
parent 26fa98a2cb
commit 8b98be2844
3 changed files with 31 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
mysql-test/r/myisam.result
View File

@@ -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;