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  1. MariaDB Server
  2. MDEV-10764 PL/SQL parser - Phase 2
  3. MDEV-15664

sql_mode=ORACLE: Make TRIM return NULL instead of empty string

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    Details

    • Type: Technical task
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 10.3
    • Fix Version/s: 10.3.6
    • Component/s: OTHER
    • Labels:
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      Description

      Earlier we made concatenation operator and SUBSTR translate empty results to NULL when running with sql_mode=ORACLE.

      Under terms of this task we'll change TRIM, LTRIM, RTRIM to do the same.

      The below scripts demonstrate Oracle's behavior:

      SELECT
        CASE
          WHEN TRIM('a' FROM 'aa') IS NULL THEN 'IS NULL'
          ELSE 'IS NOT NULL'
        END AS c
      FROM DUAL;
      

      C
      -----------
      IS NULL
      

      SELECT
        CASE
          WHEN LTRIM('  ') IS NULL THEN 'IS NULL'
          ELSE 'IS NOT NULL'
        END AS c
      FROM DUAL;
      

      C
      -----------
      IS NULL
      

      SELECT
        CASE
          WHEN RTRIM('  ') IS NULL THEN 'IS NULL'
          ELSE 'IS NOT NULL'
        END AS c
      FROM DUAL;
      

      C
      -----------
      IS NULL
      

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              Assignee:
              bar Alexander Barkov
              Reporter:
              bar Alexander Barkov
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                Dates

                Created:
                Updated:
                Resolved: