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  1. MariaDB Server
  2. MDEV-15363

Wrong result for CAST(LAST_DAY(TIME'00:00:00') AS TIME)

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 10.1, 10.2, 10.3, 10.0
    • Fix Version/s: 10.3.5
    • Component/s: Temporal Types
    • Labels:
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      Description

      SELECT
        LAST_DAY(TIME'00:00:00') AS c1,
        CAST(CAST(LAST_DAY(TIME'00:00:00') AS DATE) AS TIME) AS c2,
        CAST(LAST_DAY(TIME'00:00:00') AS TIME) AS c3;
      

      +------------+----------+------+
      | c1         | c2       | c3   |
      +------------+----------+------+
      | 2018-02-28 | 00:00:00 | NULL |
      +------------+----------+------+
      

      Notice, LAST_DAY(TIME'00:00:00') correctly returns the last day of the current month.
      If I now cast this expression as DATE, and then cast as TIME again (like in c2), it correctly returns 00:00:00.
      But if I cast this expression directly to TIME (like in c3), it erroneously returns NULL.

      It should return 00:00:00 in the column c3.

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              Assignee:
              bar Alexander Barkov
              Reporter:
              bar Alexander Barkov
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                Dates

                Created:
                Updated:
                Resolved: