[MDEV-24679] DATE_FORMAT() is not UCS2 compatible Created: 2021-01-25  Updated: 2021-01-25

Status: Open
Project: MariaDB Server
Component/s: None
Affects Version/s: 5.5, 10.1, 10.2, 10.3, 10.4, 10.5, 10.6
Fix Version/s: 10.6

Type: Bug Priority: Major
Reporter: Alexander Barkov Assignee: Alexander Barkov
Resolution: Unresolved Votes: 0
Labels: None


 Description    

SELECT DATE_FORMAT(NOW(), '%Y');


+--------------------------+
 
| DATE_FORMAT(NOW(), '%Y') |
 
+--------------------------+
 
| 2021                     |
 
+--------------------------+
 
1 row in set (0.001 sec)


SET collation_connection=ucs2_general_ci;
 
SELECT DATE_FORMAT(NOW(), '%Y');


+--------------------------+
 
| DATE_FORMAT(NOW(), '%Y') |
 
+--------------------------+
 
|  ?                       |
 
+--------------------------+

Looks wrong. The second SELECT should return `2020` like the first one does.
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