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  1. MariaDB Server
  2. MDEV-21034

GREATEST() and LEAST() malfunction for NULL

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    Details

    • Type: Bug
    • Status: Confirmed (View Workflow)
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 5.5, 10.0, 10.1, 10.2, 10.3, 10.4
    • Fix Version/s: 5.5, 10.0, 10.1, 10.2, 10.3, 10.4
    • Component/s: None
    • Labels:
      None
    • Environment:
      Ubuntu 19.04

      Description

      Hi everyone,

      On the latest trunk version (0308de9), GREATEST() and LEAST() seem to malfunction for NULL values:

      CREATE TABLE t0(c0 INT);
      INSERT INTO t0 VALUES (1);
      SELECT * FROM t0 WHERE GREATEST(c0, NULL); -- unexpected: row is fetched
      

      I would not expect the row to be fetched, because the WHERE condition should evaluate to NULL for that row:

      SELECT GREATEST(c0, NULL) FROM t0; -- NULL
      

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              Assignee:
              bar Alexander Barkov
              Reporter:
              mrigger Manuel Rigger
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                Dates

                Created:
                Updated: