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  1. MariaDB Server
  2. MDEV-11062

Different result for time type with optimizer_use_condition_selectivity=4

    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Duplicate
    • Affects Version/s: 10.1.18, 10.1, 10.2
    • Fix Version/s: N/A
    • Component/s: Optimizer
    • Labels:
      None
    • Sprint:
      10.2.4-1, 10.1.22

      Description

      Test case

      --disable_warnings
      drop table if exists t1;
      --enable_warnings
       
      SET timestamp=DEFAULT;
       
      SET @@old_mode=zero_date_time_cast;
      --echo # TIMESTAMP literal, old mode
      CREATE TABLE t1 (a TIME);
      INSERT INTO t1 VALUES ('0000-00-00 10:20:30'),('0000-00-00 10:20:31');
      INSERT INTO t1 VALUES ('0000-00-01 10:20:30'),('0000-00-01 10:20:31');
      INSERT INTO t1 VALUES ('31 10:20:30'),('32 10:20:30'),('33 10:20:30'),('34 10:20:30');
      SELECT * FROM t1;
       
      --echo # Old mode, TIMESTAMP-alike literal, zon-zero YYYYMMDD, no propagation
      SELECT * FROM t1 WHERE a='0000-00-01 10:20:30';
      SELECT * FROM t1 WHERE a='0000-00-01 10:20:30' AND LENGTH(a)=8;
      EXPLAIN EXTENDED
      SELECT * FROM t1 WHERE a='0000-00-01 10:20:30' AND LENGTH(a)=8;
      EXPLAIN EXTENDED
      SELECT * FROM t1 WHERE a='0000-00-01 10:20:30' AND LENGTH(a)=30+RAND();
       
      DROP TABLE t1;
      

      With : @@optimizer_use_condition_selectivity=1

      SELECT * FROM t1 WHERE a='0000-00-01 10:20:30';
      a
      34:20:30
      SELECT * FROM t1 WHERE a='0000-00-01 10:20:30' AND LENGTH(a)=8;
      a
      34:20:30
      

      With : @@optimizer_use_condition_selectivity=4

      SELECT * FROM t1 WHERE a='0000-00-01 10:20:30';
      a
      SELECT * FROM t1 WHERE a='0000-00-01 10:20:30' AND LENGTH(a)=8;
      a
      

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              • Assignee:
                cvicentiu Vicențiu Ciorbaru
                Reporter:
                nirbhay_c Nirbhay Choubey (Inactive)
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                Dates

                • Created:
                  Updated:
                  Resolved: