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  1. MariaDB Server
  2. MDEV-6983

BIGINT 99991231000000 to TIME'00:00:00' comparison is not consistent

Details

    • Bug
    • Status: Open (View Workflow)
    • Minor
    • Resolution: Unresolved
    • 10.0.14, 10.10.1, 10.4(EOL), 10.5, 10.6, 10.7(EOL), 10.8(EOL), 10.9(EOL), 10.10(EOL)
    • 10.4(EOL)
    • None
    • None

    Description

      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (a BIGINT, b TIME);
      		 
      INSERT INTO t1 VALUES (99991231000000,'00:00:00');
      		 
      SELECT a, b, 99991231000000=TIME'00:00:00',a=TIME'00:00:00',99991231000000=b,a=b FROM t1;

      returns the following:

      +----------------+----------+-------------------------------+------------------+------------------+------+
      		 
      | a              | b        | 99991231000000=TIME'00:00:00' | a=TIME'00:00:00' | 99991231000000=b | a=b  |
      		 
      +----------------+----------+-------------------------------+------------------+------------------+------+
      		 
      | 99991231000000 | 00:00:00 |                             1 |                0 |                1 |    0 |
      		 
      +----------------+----------+-------------------------------+------------------+------------------+------+

      That is 999991231000000=TIME'00:00:00' is:

      • equal when both are literals
      • not equal with a numeric field and a TIME literal
      • equal with a numeric literal and a TIME field
      • not equal when both are fields

      This looks inconsistent, because in all cases it should be compared as TIME,
      according to the current comparison rules.

      Attachments

        Issue Links

          is blocked by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-6991 GROUP_MIN_MAX optimization is erroneously applied in some cases

          • Major - Major loss of function.
          • Closed

          Activity

            Ascending order - Click to sort in descending order
            bar Alexander Barkov added a comment -

            This should be easier to fix after pushing the refactoring done under terms of MDEV-6991.

            bar Alexander Barkov added a comment - This should be easier to fix after pushing the refactoring done under terms of MDEV-6991 .
            bar Alexander Barkov added a comment - - edited

            The inconsistency is still repeatable in all versions between 10.4 10.10, but in a different way:

            DROP TABLE IF EXISTS t1;
            		 
            CREATE TABLE t1 (a BIGINT, b TIME);
            		 
            INSERT INTO t1 VALUES (99991231000000,'00:00:00');
            		 
            SELECT a, b, 99991231000000=TIME'00:00:00',a=TIME'00:00:00',99991231000000=b,a=b FROM t1;


            +----------------+----------+-------------------------------+------------------+------------------+------+
            		 
            | a              | b        | 99991231000000=TIME'00:00:00' | a=TIME'00:00:00' | 99991231000000=b | a=b  |
            		 
            +----------------+----------+-------------------------------+------------------+------------------+------+
            		 
            | 99991231000000 | 00:00:00 |                             1 |                0 |                1 |    1 |
            		 
            +----------------+----------+-------------------------------+------------------+------------------+------+

            bar Alexander Barkov added a comment - - edited The inconsistency is still repeatable in all versions between 10.4 10.10, but in a different way: DROP TABLE IF EXISTS t1; CREATE TABLE t1 (a BIGINT , b TIME ); INSERT INTO t1 VALUES (99991231000000, '00:00:00' ); SELECT a, b, 99991231000000= TIME '00:00:00' ,a= TIME '00:00:00' ,99991231000000=b,a=b FROM t1; +----------------+----------+-------------------------------+------------------+------------------+------+ | a | b | 99991231000000=TIME'00:00:00' | a=TIME'00:00:00' | 99991231000000=b | a=b | +----------------+----------+-------------------------------+------------------+------------------+------+ | 99991231000000 | 00:00:00 | 1 | 0 | 1 | 1 | +----------------+----------+-------------------------------+------------------+------------------+------+

            People

              bar Alexander Barkov
              bar Alexander Barkov
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              Dates

                Created:
                Updated:

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