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  1. MariaDB Server
  2. MDEV-11433

JSON_MERGE returns a non-NULL result with a NULL argument

Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • 10.2(EOL)
    • 10.2.3
    • JSON

    Description

      Note: Since we don't have any documented differences between our implementation of JSON functions and Oracle's, here and further I will assume they are supposed to be result-compatible.

      MariaDB 10.2

      		 
      MariaDB [test]> select JSON_MERGE(NULL,JSON_OBJECT('foo', 1));
      		 
      +----------------------------------------+
      		 
      | JSON_MERGE(NULL,JSON_OBJECT('foo', 1)) |
      		 
      +----------------------------------------+
      		 
      | [null, {"foo": 1}]                     |
      		 
      +----------------------------------------+
      		 
      1 row in set (0.00 sec)

      MySQL 5.7

      		 
      MySQL [test]> select JSON_MERGE(NULL,JSON_OBJECT('foo', 1));
      		 
      +----------------------------------------+
      		 
      | JSON_MERGE(NULL,JSON_OBJECT('foo', 1)) |
      		 
      +----------------------------------------+
      		 
      | NULL                                   |
      		 
      +----------------------------------------+
      		 
      1 row in set (0.00 sec)

      It is also documented in MySQL manual:
      https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-merge

      Returns NULL if any argument is NULL

      Attachments

        Issue Links

          relates to

          Task - A task that needs to be done. MDEV-9143 JSON_xxx functions

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed

          Activity

            holyfoot Alexey Botchkov added a comment -

            http://lists.askmonty.org/pipermail/commits/2016-December/010213.html

            holyfoot Alexey Botchkov added a comment - http://lists.askmonty.org/pipermail/commits/2016-December/010213.html

            People

              holyfoot Alexey Botchkov
              elenst Elena Stepanova
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              Dates

                Created:
                Updated:
                Resolved:

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