mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2026-05-15 19:37:16 +02:00
Code Issues Projects Releases Packages Wiki Activity

Fixed bug #27932: the function LOCATE returned NULL if any

Browse source 
of its arguments was evaluated to NULL, while the predicate
LOCATE(str,NULL) IS NULL erroneously was evaluated to FALSE.

This happened because the Item_func_locate::fix_length_and_dec
method by mistake set the value of the maybe_null flag for 
the function item to 0. In consequence of this the function 
was considered as the one that could not ever return NULL.


mysql-test/r/func_str.result:
  Added a test case for bug #27932.
mysql-test/t/func_str.test:
  Added a test case for bug #27932.
This commit is contained in:
unknown 2007-06-14 18:55:07 -07:00
commit 36f8bfb22e
3 changed files with 109 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

33
mysql-test/t/func_str.test
View file

@ -1076,4 +1076,37 @@ SELECT * FROM (SELECT * FROM v1) x;
DROP TABLE t1, t2;
DROP VIEW v1;
#
# Bug #27932: LOCATE with argument evaluated to NULL
#
SELECT LOCATE('foo', NULL) FROM DUAL;
SELECT LOCATE(NULL, 'o') FROM DUAL;
SELECT LOCATE(NULL, NULL) FROM DUAL;
SELECT LOCATE('foo', NULL) IS NULL FROM DUAL;
SELECT LOCATE(NULL, 'o') IS NULL FROM DUAL;
SELECT LOCATE(NULL, NULL) IS NULL FROM DUAL;
SELECT ISNULL(LOCATE('foo', NULL)) FROM DUAL;
SELECT ISNULL(LOCATE(NULL, 'o')) FROM DUAL;
SELECT ISNULL(LOCATE(NULL, NULL)) FROM DUAL;
SELECT LOCATE('foo', NULL) <=> NULL FROM DUAL;
SELECT LOCATE(NULL, 'o') <=> NULL FROM DUAL;
SELECT LOCATE(NULL, NULL) <=> NULL FROM DUAL;
CREATE TABLE t1 (id int NOT NULL PRIMARY KEY, a varchar(10), p varchar(10));
INSERT INTO t1 VALUES (1, 'foo', 'o');
INSERT INTO t1 VALUES (2, 'foo', NULL);
INSERT INTO t1 VALUES (3, NULL, 'o');
INSERT INTO t1 VALUES (4, NULL, NULL);
SELECT id, LOCATE(a,p) FROM t1;
SELECT id, LOCATE(a,p) IS NULL FROM t1;
SELECT id, ISNULL(LOCATE(a,p)) FROM t1;
SELECT id, LOCATE(a,p) <=> NULL FROM t1;
SELECT id FROM t1 WHERE LOCATE(a,p) IS NULL;
SELECT id FROM t1 WHERE LOCATE(a,p) <=> NULL;
DROP TABLE t1;
--echo End of 5.0 tests