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BUG#21310 - Trees in SQL causing a "crashed" table with MyISAM storage engine

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An update that used a join of a table to itself and modified the
table on one side of the join reported the table as crashed or
updated wrong rows.

Fixed by creating temporary table for self-joined multi update statement.
This commit is contained in:
svoj@mysql.com/april.(none)
2006-12-20 19:05:35 +04:00
parent d2fa9fd192
commit 5ad9035605
4 changed files with 99 additions and 77 deletions
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19
mysql-test/t/myisam.test
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@@ -890,4 +890,23 @@ connection default;
select * from t1;
drop table t1;
#
# BUG#21310 - Trees in SQL causing a "crashed" table with MyISAM storage
# engine
#
# A simplified test case that reflect crashed table issue.
CREATE TABLE t1(a VARCHAR(16));
INSERT INTO t1 VALUES('aaaaaaaa'),(NULL);
UPDATE t1 AS ta1, t1 AS ta2 SET ta1.a='aaaaaaaaaaaaaaaa';
SELECT * FROM t1;
DROP TABLE t1;
# A test case that reflect wrong result set.
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES(1),(2);
UPDATE t1,t1 AS t2 SET t1.a=t1.a+2 WHERE t1.a=t2.a-1;
SELECT * FROM t1 ORDER BY a;
DROP TABLE t1;
# End of 4.1 tests