[MDEV-31722] NULLIF returns wrong result if expr1 ≠ expr2 and expr1 has type YEAR(2)/YEAR(4) Created: 2023-07-17  Updated: 2023-11-28

Status: Open
Project: MariaDB Server
Component/s: None
Affects Version/s: 10.4, 10.5, 10.6, 10.9, 10.10, 11.0, 11.1, 11.2
Fix Version/s: 10.4, 10.5, 10.6, 11.0, 11.1, 11.2

Type: Bug Priority: Major
Reporter: Lena Startseva Assignee: Unassigned
Resolution: Unresolved Votes: 0
Labels: None

Issue Links:
Relates
relates to MDEV-31005 Make working cursor-protocol Stalled

 Description   

Testcase:

CREATE TABLE t1 (a YEAR(2));
 
INSERT INTO t1 VALUES (0);
 
SELECT a, NULLIF(a,2001), NULLIF(2001,a) FROM t1;
 
DROP TABLE t1;

Expected result:

a	NULLIF(a,2001)	NULLIF(2001,a)
 
00	00	2001

Actual result:

a	NULLIF(a,2001)	NULLIF(2001,a)
 
00	0	2001


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