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  1. MariaDB Server
  2. MDEV-38586

TO_DATE: DATETIME(6) instead of DATETIME(0) when format is read from a table

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Critical
    • Resolution: Not a Bug
    • N/A
    • N/A
    • Server
    • None
    • Not for Release Notes

    Description

      The review notes said that TO_DATE should return DATETIME(0) (and there is also FF extension to get fractional seconds). However, if the format is read from a table instead of a constant, the function returns DATETIME(6) even without FF:

      CREATE TABLE t (fmt VARCHAR(64));
      		 
      INSERT INTO t VALUES ('YYYY-MM-DD');
      		 
      SELECT TO_DATE('2026-01-01', fmt) FROM t;
      		 
      SELECT TO_DATE('2026-01-01', 'YYYY-MM-DD') FROM t;

      bb-12.3-MDEV-19683-to_date 7cbf7a8c641379d4318067607b71704956e87e5e

      		 
      SELECT TO_DATE('2026-01-01', fmt) FROM t;
      		 
      TO_DATE('2026-01-01', fmt)
      		 
      2026-01-01 00:00:00.000000
      		 
      SELECT TO_DATE('2026-01-01', 'YYYY-MM-DD') FROM t;
      		 
      TO_DATE('2026-01-01', 'YYYY-MM-DD')
      		 
      2026-01-01 00:00:00

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          is caused by

          New Feature - A new feature of the product, which has yet to be developed. MDEV-19683 Add support for Oracle TO_DATE()

          • Major - Major loss of function.
          • In Testing

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            People

              monty Michael Widenius
              elenst Elena Stepanova
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              Dates

                Created:
                Updated:
                Resolved:

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