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  1. MariaDB Server
  2. MDEV-8671

Wrong result for SELECT..WHERE varchar_column=' 1' AND (varchar_column XOR '1')

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    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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          Bug - A problem which impairs or prevents the functions of the product. MDEV-8728 Fix a number of problems in equal field and equal expression propagation

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

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              bar Alexander Barkov
              bar Alexander Barkov
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                Created:
                Updated:
                Resolved:

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