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  1. MariaDB Server
  2. MDEV-27221

DELETE HISTORY ignores indices

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Critical
    • Resolution: Not a Bug
    • Affects Version/s: 10.3.28, 10.6.4
    • Fix Version/s: N/A
    • Component/s: Versioned Tables
    • Labels:
      None

      Description

      To reproduce:

      CREATE TABLE t2 (x INT,
      `start_time` timestamp(6) GENERATED ALWAYS AS ROW START,
      `end_time` timestamp(6) GENERATED ALWAYS AS ROW END,
         PERIOD FOR SYSTEM_TIME (`start_time`, `end_time`)
       ) ENGINE=InnoDB DEFAULT CHARSET=utf8 WITH SYSTEM VERSIONING
        PARTITION BY SYSTEM_TIME 
       (PARTITION `p_hist` HISTORY ENGINE = InnoDB,
        PARTITION `p_cur` CURRENT ENGINE = InnoDB);
       
       
       
      ALTER TABLE t2 ADD INDEX `startendtime` (`start_time`, `end_time`);
      
      

      Select use the index

      MariaDB [test]> explain SELECT * FROM t2 FOR SYSTEM_TIME FROM '2016-01-01 00:00:00' TO '2017-01-01 00:00:00';
      +------+-------------+-------+-------+---------------+--------------+---------+------+------+-------------+
      | id   | select_type | table | type  | possible_keys | key          | key_len | ref  | rows | Extra       |
      +------+-------------+-------+-------+---------------+--------------+---------+------+------+-------------+
      |    1 | SIMPLE      | t2    | range | startendtime  | startendtime | 7       | NULL | 2    | Using where |
      +------+-------------+-------+-------+---------------+--------------+---------+------+------+-------------+
      1 row in set (0.002 sec)
      

      Delete apparently not

      MariaDB [test]> explain DELETE HISTORY FROM t2 BEFORE SYSTEM_TIME '2016-10-09 08:07:06';
      +------+-------------+-------+------+---------------+------+---------+------+------+-------------+
      | id   | select_type | table | type | possible_keys | key  | key_len | ref  | rows | Extra       |
      +------+-------------+-------+------+---------------+------+---------+------+------+-------------+
      |    1 | SIMPLE      | t2    | ALL  | NULL          | NULL | NULL    | NULL | 2    | Using where |
      +------+-------------+-------+------+---------------+------+---------+------+------+-------------+
      1 row in set (0.001 sec)
      
      

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            Assignee:
            serg Sergei Golubchik
            Reporter:
            Richard Richard Stracke
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              Dates

              Created:
              Updated:
              Resolved:

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