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Bug#19880368 : GROUP_CONCAT CRASHES AFTER DUMP_LEAF_KEY

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Problem:
find_order_by_list does not update the address of order_item
correctly after resolving.

Solution:
Change the ref_by address for a order_by field if its
SUM_FUNC_ITEM to the address of the field present in
all_fields.
This commit is contained in:
Chaithra Gopalareddy 2015-02-20 11:04:43 +05:30
parent 1a5b8122b6
commit 674367afd5
1 changed files with 11 additions and 0 deletions
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11
sql/sql_select.cc
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@ -15158,6 +15158,17 @@ find_order_in_list(THD *thd, Item **ref_pointer_array, TABLE_LIST *tables,
uint el= all_fields.elements;
all_fields.push_front(order_item); /* Add new field to field list. */
ref_pointer_array[el]= order_item;
/*
If the order_item is a SUM_FUNC_ITEM, when fix_fields is called
ref_by is set to order->item which is the address of order_item.
But this needs to be address of order_item in the all_fields list.
As a result, when it gets replaced with Item_aggregate_ref
object in Item::split_sum_func2, we will be able to retrieve the
newly created object.
*/
if (order_item->type() == Item::SUM_FUNC_ITEM)
((Item_sum *)order_item)->ref_by= all_fields.head_ref();
order->item= ref_pointer_array + el;
return FALSE;
}