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  1. MariaDB Server
  2. MDEV-229

lp:985667 Wrong result with subquery in SELECT clause, and constant table in main query and implicit grouping

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 5.5.23, 5.3.6
    • Fix Version/s: 5.5.24, 5.3.7
    • Component/s: None
    • Labels:
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      Description

      https://bugs.launchpad.net/maria/+bug/985667

      The following test case, extracted from the test for bug lp:680846 produces wrong result:

      CREATE TABLE t1 (f1 int) ;
      INSERT INTO t1 VALUES (7),(8);
       
      CREATE TABLE t2 (f2 int, f3 varchar(32)) ;
      INSERT INTO t2 VALUES (1,'f');
       
      SELECT COUNT(f2), (SELECT f1 FROM t1 WHERE t2.f2 limit 1) AS f4
      FROM t2, t1
      WHERE 'v'= t2.f3;
       
      +-----------+------+
      | COUNT(f2) | f4   |
      +-----------+------+
      |         0 |    7 |
      +-----------+------+

      The correct result is:

      +-----------+------+
      | COUNT(f2) | f4   |
      +-----------+------+
      |         0 | NULL |
      +-----------+------+

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              Assignee:
              timour Timour Katchaounov (Inactive)
              Reporter:
              sanja Oleksandr Byelkin
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                Resolved:

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