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  1. MariaDB Server
  2. MDEV-8723

Wrong result for SELECT..WHERE COLLATION(a)='binary' AND a='a'

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      Description

      In this script:

      DROP TABLE IF EXISTS t1;
      CREATE TABLE t1 (a VARBINARY(10));
      INSERT INTO t1 VALUES ('a');
      SELECT * FROM t1 WHERE COLLATION(a)='binary';
      SELECT * FROM t1 WHERE a='a'; 

      the two SELECT queries return one row.

      Now if I join both conditions using AND in the same query:

      SELECT * FROM t1 WHERE COLLATION(a)='binary' AND a='a';

      It returns empty set.

      A similar script:

      DROP TABLE IF EXISTS t1;
      CREATE TABLE t1 (a VARBINARY(10));
      INSERT INTO t1 VALUES ('a');
      SELECT * FROM t1 WHERE CHARSET(a)='binary';
      SELECT * FROM t1 WHERE a='a'; 
      SELECT * FROM t1 WHERE CHARSET(a)='binary' AND a='a';

      A similar script:

      DROP TABLE IF EXISTS t1;
      CREATE TABLE t1 (a VARBINARY(10));
      INSERT INTO t1 VALUES ('a');
      SELECT * FROM t1 WHERE COERCIBILITY(a)=2;
      SELECT * FROM t1 WHERE a='a'; 
      SELECT * FROM t1 WHERE COERCIBILITY(a)=2 AND a='a';

      A similar script:

      DROP TABLE IF EXISTS t1;
      CREATE TABLE t1 (a VARBINARY(10));
      INSERT INTO t1 VALUES ('a');
      SELECT * FROM t1 WHERE WEIGHT_STRING(a)='a';
      SELECT * FROM t1 WHERE a='a'; 
      SELECT * FROM t1 WHERE WEIGHT_STRING(a)='a' AND a='a';

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              • Assignee:
                bar Alexander Barkov
                Reporter:
                bar Alexander Barkov
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                • Created:
                  Updated:
                  Resolved: