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Fixed bug #22015: crash with GROUP_CONCAT over a derived table

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that returns the results of aggregation by GROUP_CONCAT.
The crash was due to an overflow happened for the field
sortoder->length.
The fix prevents this overflow exploiting the fact that the
value of sortoder->length cannot be greater than the value of
thd->variables.max_sort_length.
This commit is contained in:
igor@rurik.mysql.com
2006-09-20 08:08:57 -07:00
parent 0279c91d99
commit f2225cab27
3 changed files with 25 additions and 0 deletions
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9
mysql-test/r/func_gconcat.result
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@ -654,3 +654,12 @@ CHAR_LENGTH( GROUP_CONCAT(b) )
240001
SET GROUP_CONCAT_MAX_LEN = 1024;
DROP TABLE t1;
CREATE TABLE t1 (a int, b int);
INSERT INTO t1 VALUES (2,1), (1,2), (2,2), (1,3);
SELECT GROUP_CONCAT(a), x
FROM (SELECT a, GROUP_CONCAT(b) x FROM t1 GROUP BY a) AS s
GROUP BY x;
GROUP_CONCAT(a) x
2 1,2
1 2,3
DROP TABLE t1;