[MDEV-8671] Wrong result for SELECT..WHERE varchar_column=' 1' AND (varchar_column XOR '1') Created: 2015-08-24  Updated: 2015-09-12  Resolved: 2015-09-02

Status: Closed
Project: MariaDB Server
Component/s: Optimizer
Affects Version/s: 10.0, 10.1
Fix Version/s: 10.1.7

Type: Bug Priority: Major
Reporter: Alexander Barkov Assignee: Alexander Barkov
Resolution: Fixed Votes: 0
Labels: propagation, upstream-not-affected

Issue Links:
Blocks
blocks MDEV-8728 Fix a number of problems in equal fie... Closed

 Description   

This script:

DROP TABLE IF EXISTS t1;
 
CREATE TABLE t1 (a VARCHAR(10) CHARACTER SET cp1251 COLLATE cp1251_ukrainian_ci);
 
INSERT INTO t1 VALUES (' 1'),('`1'); 
SELECT * FROM t1 WHERE (a XOR '0');

returns one row:

+------+
 
| a    |
 
+------+
 
|  1   |
 
+------+

Now if I make the WHERE condition even stricter:

SELECT * FROM t1 WHERE a=' 1' AND (a XOR '0');

it erroneously returns two rows:

+------+
 
| a    |
 
+------+
 
|  1   |
 
| `1   |
 
+------+


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