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  1. MariaDB Server
  2. MDEV-5895

Bad results when casting DATE_ADD(..) to some numeric types

        Details

        • Type: Bug
        • Status: Open
        • Priority: Minor
        • Resolution: Unresolved
        • Affects Version/s: 5.5.36, 10.0.9
        • Fix Version/s: 10.0, 5.5
        • Component/s: None
        • Labels:
          None

          Description

          This query

          SELECT CAST(DATE_ADD(101, INTERVAL 1 hour_second) AS SIGNED) AS c1, CAST(DATE_ADD(101, INTERVAL 1 hour_second) AS DOUBLE) AS c2,  CAST(DATE_ADD(101, INTERVAL 1 hour_second) AS DECIMAL(20)) AS c3;

          returns:

          +------+----------------+----------------+
| c1   | c2             | c3             |
+------+----------------+----------------+
| 2000 | 20000101000001 | 20000101000001 |
+------+----------------+----------------+

          The result must be the same for all three expressions.
          The question is: which is correct?

          The return value for "DATE_ADD(101, INTERVAL 1 hour_second)"
          is '2000-01-01 00:00:01'. But the data type in this context is VARCHAR
          (note VARCHAR is correct, as the argument is not a temporal data type!).
          So it should probably return 2000 in all three cases, i.e. parse
          the returned value as a string, without trying to treat it as a datetime.

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                  • Assignee:
                    bar Alexander Barkov
                    Reporter:
                    bar Alexander Barkov
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                    Dates

                    • Created:
                      Updated: