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  1. Derby
  2. DERBY-4372

Wrong result for simple join when index is created

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: 10.1.3.3, 10.2.2.1, 10.5.1.1
    • Fix Version/s: 10.5.3.1, 10.6.1.0
    • Component/s: SQL
    • Labels:
      None
    • Urgency:
      Urgent
    • Issue & fix info:
      Repro attached
    • Bug behavior facts:
      Wrong query result

      Description

      In the example below, the first SELECT has correct result. After the index is created, the second SELECT gives wrong result.

      ij> CREATE TABLE t1 (i1 INT, j1 INT);
      0 rows inserted/updated/deleted
      ij> CREATE TABLE t2 (i2 INT, j2 INT);
      0 rows inserted/updated/deleted
      ij> INSERT INTO t1 VALUES (8, 8),(NULL, 8);
      2 rows inserted/updated/deleted
      ij> INSERT INTO t2 VALUES (8, 8);
      1 row inserted/updated/deleted
      ij> SELECT * FROM t1 INNER JOIN t2 ON (t2.j2 = t1.i1) OR (t2.j2 = t1.j1);
      I1 |J1 |I2 |J2
      -----------------------------------------------
      8 |8 |8 |8
      NULL |8 |8 |8

      2 rows selected
      ij> CREATE INDEX ix2 ON t2(j2);
      0 rows inserted/updated/deleted
      ij> SELECT * FROM t1 INNER JOIN t2 ON (t2.j2 = t1.i1) OR (t2.j2 = t1.j1);
      I1 |J1 |I2 |J2
      -----------------------------------------------
      8 |8 |8 |8

      1 row selected

        Attachments

        1. experiment.diff
          2 kB
          Knut Anders Hatlen
        2. derby-4372-1a.stat
          0.2 kB
          Knut Anders Hatlen
        3. derby-4372-1a.diff
          5 kB
          Knut Anders Hatlen

          Activity

            People

            • Assignee:
              knutanders Knut Anders Hatlen
              Reporter:
              bernt Bernt M. Johnsen
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              Dates

              • Created:
                Updated:
                Resolved: