[MDEV-9343] Copying from YEAR to DATE result in '0000-00-00' Created: 2015-12-30  Updated: 2023-04-27

Status: Open
Project: MariaDB Server
Component/s: Data types, Temporal Types
Affects Version/s: 5.5, 10.0, 10.1, 10.2
Fix Version/s: 10.4

Type: Bug Priority: Major
Reporter: Alexander Barkov Assignee: Alexander Barkov
Resolution: Unresolved Votes: 1
Labels: None

Issue Links:
Relates
relates to MDEV-16926 CAST(COALESCE(year_field)) returns wr... Closed
Epic Link: Data type cleanups

 Description   

These scripts:

DROP TABLE IF EXISTS t1,t2;
 
CREATE TABLE t1 (a DATETIME);
 
CREATE TABLE t2 (a YEAR);
 
INSERT INTO t2 VALUES (2000);
 
INSERT INTO t1 SELECT * FROM t2;
 
SELECT * FROM t1;
 

DROP TABLE IF EXISTS t1;
 
CREATE TABLE t1 (a YEAR);
 
INSERT INTO t1 VALUES (2000);
 
ALTER TABLE t1 MODIFY a DATETIME;
 
SHOW WARNINGS;
 
SELECT * FROM t1;

return

+---------------------+
 
| a                   |
 
+---------------------+
 
| 0000-00-00 00:00:00 |
 
+---------------------+

The year value could be preserved when NO_ZERO_IN_DATE is not set.
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