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Fixed bug mdev-4336.

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When iterating over a list of conditions using List_iterator
the function remove_eq_conds should skip all predicates that
replace a condition from the list. Otherwise it can come to
an infinite recursion.
This commit is contained in:
Igor Babaev
2013-05-03 22:46:45 -07:00
parent b249680fd1
commit 920c479c6e
4 changed files with 57 additions and 3 deletions
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15
sql/sql_select.cc
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@@ -13197,7 +13197,8 @@ remove_eq_conds(THD *thd, COND *cond, Item::cond_result *cond_value)
else
{
Item *list_item;
Item *new_list_item;
Item *new_list_item;
uint cnt= new_item_and_list->elements;
List_iterator<Item> it(*new_item_and_list);
while ((list_item= it++))
{
@@ -13211,7 +13212,9 @@ remove_eq_conds(THD *thd, COND *cond, Item::cond_result *cond_value)
it.replace(new_list_item);
new_list_item->update_used_tables();
}
li.replace(*new_item_and_list);
li.replace(*new_item_and_list);
for (cnt--; cnt; cnt--)
item= li++;
}
cond_and_list->concat((List<Item>*) cond_equal_items);
}
@@ -13232,7 +13235,13 @@ remove_eq_conds(THD *thd, COND *cond, Item::cond_result *cond_value)
if (new_item->type() == Item::COND_ITEM &&
((Item_cond*) new_item)->functype() ==
((Item_cond*) cond)->functype())
li.replace(*((Item_cond*) new_item)->argument_list());
{
List<Item> *arg_list= ((Item_cond*) new_item)->argument_list();
uint cnt= arg_list->elements;
li.replace(*arg_list);
for ( cnt--; cnt; cnt--)
item= li++;
}
else
li.replace(new_item);
}