[MDEV-13119] Wrong results with CAST(AS CHAR) and subquery Created: 2017-06-19  Updated: 2018-10-15  Resolved: 2018-10-15

Status: Closed
Project: MariaDB Server
Component/s: OTHER
Affects Version/s: 10.0, 10.1, 10.2, 10.3
Fix Version/s: 10.0.34, 10.1.31, 10.2.13, 10.3.5

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

Issue Links:
Relates
relates to MDEV-13120 Wrong results with MAKE_SET() and sub... Closed
relates to MDEV-13790 UNHEX() of a somewhat complicated CON... Closed
relates to MDEV-10306 Wrong results with combination of CON... Closed

 Description   

This problem is similar to MDEV-10306

This script:

SET optimizer_switch=_utf8'derived_merge=on';
 
DROP TABLE IF EXISTS t1;
 
CREATE TABLE t1 (t VARCHAR(10) CHARSET latin1);
 
INSERT INTO t1 VALUES('abcdefghi');
 
SELECT CONCAT(t2,'-',t2) c2 FROM (SELECT CAST(t AS CHAR CHARACTER SET utf8) t2 FROM t1) sub;

returns a wrong result:

+--------------------+
 
| c2                 |
 
+--------------------+
 
| abcdefghiabcdefghi |
 
+--------------------+

Notice, there is no the expected dash character in the result.

 Comments   
Comment by Alexander Barkov [ 2018-10-15 ]

Was fixed by MDEV-13790

Generated at Thu Feb 08 08:03:03 UTC 2024 using Jira 8.20.16#820016-sha1:9d11dbea5f4be3d4cc21f03a88dd11d8c8687422.