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Bug #45989 take 2 : memory leak after explain encounters an

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error in the query.

Fixes a leak after materializing a GROUP BY subquery to a 
temp table when the subquery has a blob column in the SELECT
list.
Fixed by correctly destructing temporary buffers after doing
the conversion.
This commit is contained in:
Georgi Kodinov
2010-01-18 17:50:46 +02:00
parent 22cff39274
commit a3b4065d90
3 changed files with 31 additions and 0 deletions
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12
mysql-test/r/subselect.result
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@ -4602,4 +4602,16 @@ SELECT 1 FROM t1 GROUP BY
1
1
DROP TABLE t1;
#
# Bug #45989 take 2 : memory leak after explain encounters an
# error in the query
#
CREATE TABLE t1(a LONGTEXT);
INSERT INTO t1 VALUES (repeat('a',@@global.max_allowed_packet));
INSERT INTO t1 VALUES (repeat('b',@@global.max_allowed_packet));
EXPLAIN EXTENDED SELECT DISTINCT 1 FROM t1,
(SELECT DISTINCTROW a AS away FROM t1 GROUP BY a WITH ROLLUP) AS d1
WHERE t1.a = d1.a;
ERROR 42S22: Unknown column 'd1.a' in 'where clause'
DROP TABLE t1;
End of 5.1 tests.