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  1. MariaDB Server
  2. MDEV-10232

Scalar result of subquery changes after adding an outer select stmt

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 10.1.10, 10.1, 10.2, 10.0
    • Fix Version/s: 10.1.22, 10.2.4
    • Component/s: Optimizer
    • Labels:
      None
    • Sprint:
      10.1.15, 10.1.21

      Description

      Output:
      ===

      mysql> create table t1(c1 int, c2 int, primary key(c2));
      Query OK, 0 rows affected (0.01 sec)
       
      mysql> insert into t1 values(2,1),(1,2);
      (select c1 frQuery OK, 2 rows affected (0.00 sec)
      Records: 2  Duplicates: 0  Warnings: 0
       
      mysql> select (select c1 from t1 group by c1,c2 order by c1 limit 1) as x;
      +------+
      | x    |
      +------+
      |    2 |
      +------+
      1 row in set (0.00 sec)
       
      mysql> (select c1 from t1 group by c1,c2 order by c1 limit 1);
      +------+
      | c1   |
      +------+
      |    1 |
      +------+
      1 row in set (0.00 sec)
       
      mysql> select version();
      +---------------------+
      | version()           |
      +---------------------+
      | 10.1.10-MariaDB-log |
      +---------------------+
      1 row in set (0.00 sec)
      
      

      Recreate:
      ===

       
      drop table t1;
      create table t1(c1 int, c2 int, primary key(c2));
      insert into t1 values(2,1),(1,2);
      select (select c1 from t1 group by c1,c2 order by c1 limit 1) as x;
      (select c1 from t1 group by c1,c2 order by c1 limit 1);
      

      Problem:
      ===
      1 is expected for both queries.

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            Assignee:
            varun Varun Gupta
            Reporter:
            dylan Dylan Su
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              Dates

              Created:
              Updated:
              Resolved: