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  1. MariaDB Server
  2. MDEV-10052

Illegal mix of collations with DAYNAME(date_field)<>varchar_field

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      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (c VARCHAR(8) CHARACTER SET latin1, d DATE);
      		 
      INSERT INTO t1 VALUES ('test',now());
      		 
      SELECT * FROM t1 WHERE DAYNAME(d)<>c;

      returns an error:

      ERROR 1267 (HY000): Illegal mix of collations (utf8_general_ci,COERCIBLE) and (latin1_swedish_ci,IMPLICIT) for operation '<>'

      It should work without errors.

      The same problem is repeatable with MONTHNAME:

      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (c VARCHAR(8) CHARACTER SET latin1, d DATE);
      		 
      INSERT INTO t1 VALUES ('test',now());
      		 
      SELECT * FROM t1 WHERE MONTHNAME(d)<>c;

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

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