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  1. MariaDB Server
  2. MDEV-663

LP:1001092 - Query with GROUP BY returns an extra row

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      Description

      The following test case produces a wrong result in MariaDB 5.2:

      CREATE TABLE t1 (vc varchar(1), INDEX vc_idx (vc)) ;
      INSERT INTO t1 VALUES (NULL), ('o'), (NULL), ('p'), ('c');
      FLUSH TABLE t1;
      SELECT vc FROM t1 GROUP BY vc;

      MariaDB [test]> SELECT vc FROM t1 GROUP BY vc;
      ------

      vc

      ------

      NULL
      NULL
      c
      o
      p

      ------
      5 rows in set (0.01 sec)

      (See also bug #12837714 in mysql-trunk)

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            Assignee:
            sanja Oleksandr Byelkin
            Reporter:
            igor Igor Babaev
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