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  1. MariaDB Server
  2. MDEV-12429

Wrong result from a query with IN subquery used in WHERE of EXISTS subquery.

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • 5.5, 10.0, 10.1, 10.2
    • 5.5.55
    • Optimizer
    • None

    Description

      The following test case produces a wrong result set:

      CREATE TABLE t1 (
      		 
        pk INT, f1 INT NOT NULL, f2 VARCHAR(3), f3 INT NULL, PRIMARY KEY(pk)) ENGINE=MyISAM;
      		 
      INSERT INTO t1 VALUES (1,1,'foo',8), (2,5,'bar',7);
      		 
       
      		 
      SELECT sq1.f2    FROM t1 AS sq1 
          WHERE EXISTS ( SELECT * FROM t1 AS sq2                      
                                           WHERE sq1.`pk` IN ( SELECT f1 FROM t1 ) AND sq2.f1 = sq1.f1 );
      		 
       
      		 
      MariaDB [test]> SELECT sq1.f2    FROM t1 AS sq1     WHERE EXISTS ( SELECT * FROM t1 AS sq2                       WHERE sq1.`pk` IN ( SELECT f1 FROM t1 ) AND sq2.f1 = sq1.f1 );
      		 
      Empty set (0.00 sec)

      The problem is reproduced in 10.0,10.1,10.2 with the same test case if subquery_cache is set to 'off' in the optimizer switch:

      set optimizer_switch='subquery_cache=off';

      Attachments

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-9685 Wrong result (missing rows) with MERGE view or derived_merge, IN subqueries

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-12145 Wrong result (missing rows) on query with IN and EXISTS subqueries from InnoDB tables

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-9686 Wrong result (wrong values) with subquery in select list, semijoin+materialization

          • Major - Major loss of function.
          • Closed

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              igor Igor Babaev
              igor Igor Babaev
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              Dates

                Created:
                Updated:
                Resolved:

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