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  1. MariaDB Server
  2. MDEV-5444

COERCIBILITY() returns different results in prepared vs direct execution

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    Details

    • Type: Bug
    • Status: Open (View Workflow)
    • Priority: Minor
    • Resolution: Unresolved
    • Affects Version/s: 5.5.36, 10.0.10
    • Fix Version/s: 5.5
    • Component/s: None
    • Labels:

      Description

      COERCIBILITY() returns different results in prepared vs direct
      execution in some tricky cases, e.g. conversion of a temporal
      hybrid function to a non-ASCII character set:

      mysql> SET NAMES utf8, collation_connection=utf16_general_ci;
      Query OK, 0 rows affected (0.00 sec)
       
      mysql> SELECT COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY));
      +-----------------------------------------------------------------------+
      | COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY)) |
      +-----------------------------------------------------------------------+
      |                                                                     4 |
      +-----------------------------------------------------------------------+
      1 row in set (3.24 sec)
       
      mysql> PREPARE stmt FROM "SELECT COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY))";
      Query OK, 0 rows affected (0.00 sec)
      Statement prepared
       
      mysql> EXECUTE stmt;
      +-----------------------------------------------------------------------+
      | COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY)) |
      +-----------------------------------------------------------------------+
      |                                                                     2 |
      +-----------------------------------------------------------------------+
      1 row in set (0.00 sec)
       

      This, in particular, make some tests fail in --ps mode but pass in "normal" mode:
      http://buildbot.askmonty.org/buildbot/builders/bld-dan-debug/builds/985/steps/test_1/logs/stdio

      Prepared execution should be fixed to return the same results with direct execution.

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            Assignee:
            bar Alexander Barkov
            Reporter:
            bar Alexander Barkov
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              Dates

              Created:
              Updated:

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