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Bug#46815 CONCAT_WS returning wrong data

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The problem is that argument buffer can be used as result buffer
and it leads to argument value change.
The fix is to use 'old buffer' as result buffer only
if first argument is not constant item.
This commit is contained in:
Sergey Glukhov
2009-09-10 15:24:07 +05:00
parent 54847efffd
commit 5fbc2904bc
3 changed files with 28 additions and 1 deletions
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9
mysql-test/r/func_str.result
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@@ -2196,4 +2196,13 @@ SELECT LOAD_FILE(a) FROM t1;
LOAD_FILE(a)
NULL
DROP TABLE t1;
CREATE TABLE t1 (f2 VARCHAR(20));
CREATE TABLE t2 (f2 VARCHAR(20));
INSERT INTO t1 VALUES ('MIN'),('MAX');
INSERT INTO t2 VALUES ('LOAD');
SELECT CONCAT_WS('_', (SELECT t2.f2 FROM t2), t1.f2) AS concat_name FROM t1;
concat_name
LOAD_MIN
LOAD_MAX
DROP TABLE t1, t2;
End of 5.0 tests