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  1. MariaDB Server
  2. MDEV-28072

JSON_EXTRACT has inconsistent behavior with '0' value in json path (when range is used)

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 10.9.1
    • Component/s: JSON
    • Labels:
      None

      Description

      Test:

      SET @json= '[ 11, 22 , 33]';
      SELECT JSON_EXTRACT(@json, '$[-2 to 1]');
      SELECT JSON_EXTRACT(@json, '$[-1 to 1]');
      SELECT JSON_EXTRACT(@json, '$[-1 to 0]');
      SELECT JSON_EXTRACT(@json, '$[0 to 0]');
      SELECT JSON_EXTRACT(@json, '$[-0 to 0]');
      SELECT JSON_EXTRACT(@json, '$[-0 to 1]');
      SELECT JSON_EXTRACT(@json, '$[0 to -0]');
      

      Actual result:

      SET @json= '[ 11, 22 , 33]';
      SELECT JSON_EXTRACT(@json, '$[-2 to 1]');
      JSON_EXTRACT(@json, '$[-2 to 1]')
      [22]
      SELECT JSON_EXTRACT(@json, '$[-1 to 1]');
      JSON_EXTRACT(@json, '$[-1 to 1]')
      NULL
      SELECT JSON_EXTRACT(@json, '$[-1 to 0]');
      JSON_EXTRACT(@json, '$[-1 to 0]')
      NULL
      Warnings:
      Warning	4042	Syntax error in JSON path in argument 2 to function 'json_extract' at position 9
      SELECT JSON_EXTRACT(@json, '$[0 to 0]');
      JSON_EXTRACT(@json, '$[0 to 0]')
      NULL
      Warnings:
      Warning	4042	Syntax error in JSON path in argument 2 to function 'json_extract' at position 8
      SELECT JSON_EXTRACT(@json, '$[-0 to 0]');
      JSON_EXTRACT(@json, '$[-0 to 0]')
      NULL
      Warnings:
      Warning	4042	Syntax error in JSON path in argument 2 to function 'json_extract' at position 9
      SELECT JSON_EXTRACT(@json, '$[-0 to 1]');
      JSON_EXTRACT(@json, '$[-0 to 1]')
      [11, 22]
      SELECT JSON_EXTRACT(@json, '$[0 to -0]');
      JSON_EXTRACT(@json, '$[0 to -0]')
      [11]
      

      Look like '0' on the right side of range is bad value, but '-0' - is good value. Why?

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              Assignee:
              rucha174 Rucha Deodhar
              Reporter:
              lstartseva Lena Startseva
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                Dates

                Created:
                Updated:
                Resolved:

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