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  1. MariaDB Server
  2. MDEV-29821

DATE/DATETIME null-safe equals should consider expressions that evaluate to NULL <=> NULL as equal

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Details

    • Bug
    • Status: Open (View Workflow)
    • Major
    • Resolution: Unresolved
    • 10.6.3, 10.3.36, 10.5.17, 10.9.2
    • 10.4, 10.5, 10.6
    • Data types
    • None

    Description

      This was found on MariaDB 10.6.3. There are some inconsistencies in the below expressions using <=>, which I'd expect to all equal 1.

      mariadb10.6.3> SELECT CAST(-1 AS DATETIME),
                            CAST(NULL AS DATETIME),
                            CAST(-1 AS DATE), CAST(NULL AS DATE),
                            CAST(-1 AS DATETIME) <=> CAST(NULL AS DATETIME),
                            CAST(-1 AS DATETIME) <=> NULL,
                            CAST(NULL AS DATETIME) <=> NULL,
                            CAST(-1 AS DATE) <=> CAST(NULL AS DATE),
                            CAST(-1 AS DATE) <=> NULL,
                            CAST(NULL AS DATE) <=> NULL, NULL <=> NULL\G
      *************************** 1. row ***************************
                                 CAST(-1 AS DATETIME): NULL
                               CAST(NULL AS DATETIME): NULL
                                     CAST(-1 AS DATE): NULL
                                   CAST(NULL AS DATE): NULL
      CAST(-1 AS DATETIME) <=> CAST(NULL AS DATETIME): 0
                        CAST(-1 AS DATETIME) <=> NULL: 0
                      CAST(NULL AS DATETIME) <=> NULL: 1
              CAST(-1 AS DATE) <=> CAST(NULL AS DATE): 0
                            CAST(-1 AS DATE) <=> NULL: 0
                          CAST(NULL AS DATE) <=> NULL: 1
                                        NULL <=> NULL: 1
      1 row in set, 6 warnings (0.00 sec)
      

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            bar Alexander Barkov
            jcd Johnathan Davis
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            Dates

              Created:
              Updated:

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