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Fix for bug #1335: filesort is missing in EXPLAIN if ORDER BY NULL is used

Browse Source 
mysql-test/r/group_by.result:
  test results fixed
mysql-test/t/group_by.test:
  added few explicit tests for bug #1335
This commit is contained in:
unknown
2003-12-09 23:52:58 +03:00
parent 6f96fb7956
commit 1c30ec0970
3 changed files with 56 additions and 3 deletions
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14
sql/sql_select.cc
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@ -696,8 +696,18 @@ mysql_select(THD *thd,TABLE_LIST *tables,List<Item> &fields,COND *conds,
if (select_options & SELECT_DESCRIBE)
{
if (!order && !no_order)
order=group;
/*
Check if we managed to optimize ORDER BY away and don't use temporary
table to resolve ORDER BY: in that case, we only may need to do
filesort for GROUP BY.
*/
if (!order && !no_order && (!skip_sort_order || !need_tmp))
{
/* Reset 'order' to 'group' and reinit variables describing 'order' */
order= group;
simple_order= simple_group;
skip_sort_order= 0;
}
if (order &&
(join.const_tables == join.tables ||
((simple_order || skip_sort_order) &&