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Fix bug#13356 resolve_const_item() wasn't able to handle Item_row items.

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resolve_const_item() assumed to be not called for Item_row items. For
ensuring that DBUG_ASSERT(0) was set there.

This patch adds section for Item_row items. If it can it recursively calls
resolve_const_item() for each item the Item_row contains. If any of the
contained items is null then whole Item_row substitued by Item_null. Otherwise
it just returns.
This commit is contained in:
evgen@moonbone.local 2005-09-28 00:58:12 +04:00
parent a5feed9813
commit 4f4711bd49
3 changed files with 48 additions and 0 deletions
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9
mysql-test/r/select.result
View file

@ -2617,3 +2617,12 @@ select found_rows();
found_rows()
1
DROP TABLE t1;
create table t1(f1 int, f2 int);
create table t2(f3 int);
select f1 from t1,t2 where f1=f2 and (f1,f2) = ((1,1));
f1
select f1 from t1,t2 where f1=f2 and (f1,NULL) = ((1,1));
f1
select f1 from t1,t2 where f1=f2 and (f1,f2) = ((1,NULL));
f1
drop table t1,t2;

10
mysql-test/t/select.test
View file

@ -2164,4 +2164,14 @@ select found_rows();
DROP TABLE t1;
#
# Bug #13356 assertion failed in resolve_const_item()
#
create table t1(f1 int, f2 int);
create table t2(f3 int);
select f1 from t1,t2 where f1=f2 and (f1,f2) = ((1,1));
select f1 from t1,t2 where f1=f2 and (f1,NULL) = ((1,1));
select f1 from t1,t2 where f1=f2 and (f1,f2) = ((1,NULL));
drop table t1,t2;
# End of 4.1 tests

29
sql/item.cc
View file

@ -2870,6 +2870,35 @@ void resolve_const_item(THD *thd, Item **ref, Item *comp_item)
new_item= (null_value ? (Item*) new Item_null(name) :
(Item*) new Item_int(name, result, length));
}
else if (res_type == ROW_RESULT)
{
new_item= 0;
/*
If item and comp_item are both Item_rows and have same number of cols
then process items in Item_row one by one. If Item_row contain nulls
substitute it by Item_null. Otherwise just return.
*/
if (item->result_type() == comp_item->result_type() &&
((Item_row*)item)->cols() == ((Item_row*)comp_item)->cols())
{
Item_row *item_row= (Item_row*)item,*comp_item_row= (Item_row*)comp_item;
if (item_row->null_inside())
new_item= (Item*) new Item_null(name);
else
{
int i= item_row->cols() - 1;
for (; i >= 0; i--)
{
if (item_row->maybe_null && item_row->el(i)->is_null())
{
new_item= (Item*) new Item_null(name);
break;
}
resolve_const_item(thd, item_row->addr(i), comp_item_row->el(i));
}
}
}
}
else
{ // It must REAL_RESULT
double result=item->val();