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  1. MariaDB Server
  2. MDEV-9413

"datetime >= coalesce(c1(NULL))" doesn't return expected NULL

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: 10.1.10, 5.3.13, 5.5, 10.0, 10.1
    • Fix Version/s: 5.5.49
    • Component/s: Temporal Types
    • Labels:
      None
    • Sprint:
      10.0.25

      Description

      Output:

      mysql> create table t1(c1 timestamp(6) null default null);
      Query OK, 0 rows affected (0.01 sec)
       
      mysql> insert into t1 values(NULL);
      Query OK, 1 row affected (0.00 sec)
       
      mysql> select c1, '2016-06-13 20:00:00.000003' >= COALESCE( c1 ) from t1;
      +------+------------------------------------------------+
      | c1   | '2016-06-13 20:00:00.000003' >= COALESCE( c1 ) |
      +------+------------------------------------------------+
      | NULL |                                              1 |
      +------+------------------------------------------------+
      1 row in set (0.00 sec)
       
      mysql>
      mysql> select version();
      +-----------------+
      | version()       |
      +-----------------+
      | 10.1.10-MariaDB |
      +-----------------+
      1 row in set (0.00 sec)
       

      Recreate:

       
      drop table if exists t1;
      create table t1(c1 timestamp(6) null default null);
      insert into t1 values(NULL);
      select c1, '2016-06-13 20:00:00.000003' >= COALESCE( c1 ) from t1;
       
       

      Problem:
      NULL is expected.

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            Assignee:
            bar Alexander Barkov
            Reporter:
            dylan Dylan Su
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              Dates

              Created:
              Updated:
              Resolved: