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BUG#17047: CHAR() and IN() can return NULL without signaling NULL result

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The problem was that some functions (namely IN() starting with 4.1, and
CHAR() starting with 5.0) were returning NULL in certain conditions,
while they didn't set their maybe_null flag.  Because of that there could
be some problems with 'IS NULL' check, and statements that depend on the
function value domain, like CREATE TABLE t1 SELECT 1 IN (2, NULL);.

The fix is to set maybe_null correctly.
This commit is contained in:
kroki/tomash@moonlight.intranet
2006-11-16 13:21:38 +03:00
parent 6a28c436f7
commit b8d5451565
3 changed files with 29 additions and 2 deletions
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8
mysql-test/r/func_in.result
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@ -202,3 +202,11 @@ select count(*) from t1 where id not in (1,2);
count(*)
1
drop table t1;
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 SELECT 1 IN (2, NULL);
SELECT should return NULL.
SELECT * FROM t1;
1 IN (2, NULL)
NULL
DROP TABLE t1;
End of 4.1 tests