1. 10 Jan, 2011 1 commit
    • Magne Mahre's avatar
      Bug#57986 ORDER BY clause is not used after a UNION, · 1b645167
      Magne Mahre authored
                if embedded in a SELECT
                  
      An ORDER BY clause was bound to the incorrect
      (sub-)statement when used in a UNION context.
                  
      In a query like:
      SELECT * FROM a UNION SELECT * FROM b ORDER BY c
      the result of SELECT * FROM b is sorted, and then
      combined with a.  The correct behaviour is that
      the ORDER BY clause should be applied on the
      final set.   Similar behaviour was seen on LIMIT
      clauses as well.
                  
      In a UNION statement, there will be a select_lex
      object for each of the two selects, and a 
      select_lex_unit object that describes the UNION
      itself.  Similarly, the same behaviour was also
      seen on derived tables.
                  
      The bug was caused by using a grammar rule for
      ORDER BY and LIMIT that bound these elements
      to thd->lex->current_select, which points to the
      last of the two selects, instead of to the 
      fake_select_lex member of the master select_lex_unit
      object.
      
      
      sql/sql_yacc.yy:
        Need to use (opt_)union_order_or_limit to
        bind to the correct select_lex object.
      1b645167
  2. 08 Jan, 2011 5 commits
  3. 07 Jan, 2011 17 commits
  4. 06 Jan, 2011 7 commits
  5. 05 Jan, 2011 10 commits