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Backporting of jorgen.loland@sun.com-20100618093212-lifp1psig3hbj6jj

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from mysql-next-mr-opt-backporting.

Bug#54515: Crash in opt_range.cc::get_best_group_min_max on 
           SELECT from VIEW with GROUP BY
      
When handling the grouping items in get_best_group_min_max, the
items need to be of type Item_field. In this bug, an ASSERT 
triggered because the item used for grouping was an 
Item_direct_view_ref (i.e., the group column is from a view). 
The fix is to get the real_item since Item_ref* pointing to 
Item_field is ok.
This commit is contained in:
Olav Sandstaa
2010-07-08 15:19:05 +02:00
parent 65bdafda29
commit b7166f33d0
3 changed files with 44 additions and 2 deletions
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4
sql/opt_range.cc
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@@ -9570,8 +9570,8 @@ get_best_group_min_max(PARAM *param, SEL_TREE *tree, double read_time)
first Item? If so, then why? What is the array for?
*/
/* Above we already checked that all group items are fields. */
DBUG_ASSERT((*tmp_group->item)->type() == Item::FIELD_ITEM);
Item_field *group_field= (Item_field *) (*tmp_group->item);
DBUG_ASSERT((*tmp_group->item)->real_item()->type() == Item::FIELD_ITEM);
Item_field *group_field= (Item_field *) (*tmp_group->item)->real_item();
if (group_field->field->eq(cur_part->field))
{
cur_group_prefix_len+= cur_part->store_length;