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  1. MariaDB Server
  2. MDEV-17846

Inconsistent results with optimizer_switch='derived_merge=ON/OFF';

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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, 10.3.11
    • Fix Version/s: 5.5
    • Component/s: None
    • Labels:
      None
    • Environment:
      Redhat el6

      Description

      With the same select statement, it produces different results with optimizer_switch='derived_merge=ON'; and optimizer_switch='derived_merge=OFF';

      Reproduce test case:
      1. Follow the test_case.rtf attached, create table t1 and insert data into t1; create table t2 and insert data to t2.
      2. Set optimizer_switch='derived_merge=ON'; and run the select statement. It has empty set result.
      3. Set optimizer_switch='derived_merge=OFF'; and run the same select statement. It has result set:
      ------------------------------+

      T_FP Test_Value

      ------------------------------+

      731834939448428685 22

      ------------------------------+

      Thanks,

      KT Chow

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            Assignee:
            igor Igor Babaev
            Reporter:
            ktchow_ogcio Chow King Tak
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              Dates

              Created:
              Updated:

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