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  1. MariaDB Server
  2. MDEV-6971

Bad results with joins comparing TIME and DOUBLE/DECIMAL columns

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 5.5.40, 10.0.14
    • Fix Version/s: 10.0.15
    • Component/s: Optimizer
    • Labels:
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      Description

      DROP TABLE IF EXISTS t1,t2;
      CREATE TABLE t1 (a TIME(6) PRIMARY KEY);
      INSERT INTO t1 VALUES ('10:20:30');
      DROP TABLE IF EXISTS t2;
      CREATE TABLE t2 (a DOUBLE);
      INSERT INTO t2 VALUES (102030),(102030.000000001);
      SELECT t1.* FROM t1 JOIN t2 USING(a);
      SELECT t1.* FROM t1 LEFT JOIN t2 USING(a);

      Both SELECT queries correctly return 2 rows.

      If I add a primary key on t2 and return the same queries:

      ALTER TABLE t2 ADD PRIMARY KEY(a);
      SELECT t1.* FROM t1 JOIN t2 USING(a);
      SELECT t1.* FROM t1 LEFT JOIN t2 USING(a);

      both SELECT queries return only one row.
      This is wrong. Two rows are expected for both queries.

      The same problem is repeatable if I change t2.a from DOUBLE to DECIMAL(30,10).

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            Assignee:
            bar Alexander Barkov
            Reporter:
            bar Alexander Barkov
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              Updated:
              Resolved:

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