database/mariadb
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Merge epotemkin@bk-internal.mysql.com:/home/bk/mysql-4.1

Browse Source 
into moonbone.local:/work/14482-bug-4.1-mysql
This commit is contained in:
evgen@moonbone.local 2005-11-24 19:17:31 +03:00
commit e3cab037bf
3 changed files with 31 additions and 3 deletions
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8
mysql-test/r/select.result
View File

@ -2706,3 +2706,11 @@ select distinct count(f2) >0 from t1 left join t2 on f1=f3 group by f1;
count(f2) >0
1
drop table t1,t2;
create table t1 (f1 int,f2 int);
insert into t1 values(1,1);
create table t2 (f3 int, f4 int, primary key(f3,f4));
insert into t2 values(1,1);
select * from t1 where f1 in (select f3 from t2 where (f3,f4)= (select f3,f4 from t2));
f1 f2
1 1
drop table t1,t2;

11
mysql-test/t/select.test
View File

@ -2237,4 +2237,15 @@ insert into t1 values (1,1);
insert into t2 values (1,1),(1,2);
select distinct count(f2) >0 from t1 left join t2 on f1=f3 group by f1;
drop table t1,t2;
#
# Bug #14482 Server crash when subselecting from the same table
#
create table t1 (f1 int,f2 int);
insert into t1 values(1,1);
create table t2 (f3 int, f4 int, primary key(f3,f4));
insert into t2 values(1,1);
select * from t1 where f1 in (select f3 from t2 where (f3,f4)= (select f3,f4 from t2));
drop table t1,t2;
# End of 4.1 tests

15
sql/item.cc
View File

@ -2863,7 +2863,7 @@ Item_result item_cmp_type(Item_result a,Item_result b)
void resolve_const_item(THD *thd, Item **ref, Item *comp_item)
{
Item *item= *ref;
Item *new_item;
Item *new_item= NULL;
if (item->basic_const_item())
return; // Can't be better
Item_result res_type=item_cmp_type(comp_item->result_type(),
@ -2892,8 +2892,17 @@ 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)
else if (res_type == ROW_RESULT && item->type() == Item::ROW_ITEM &&
comp_item->type() == Item::ROW_ITEM)
{
/*
Substitute constants only in Item_rows. Don't affect other Items
with ROW_RESULT (eg Item_singlerow_subselect).
For such Items more optimal is to detect if it is constant and replace
it with Item_row. This would optimize queries like this:
SELECT * FROM t1 WHERE (a,b) = (SELECT a,b FROM t2 LIMIT 1);
*/
Item_row *item_row= (Item_row*) item;
Item_row *comp_item_row= (Item_row*) comp_item;
uint col;
@ -2910,7 +2919,7 @@ void resolve_const_item(THD *thd, Item **ref, Item *comp_item)
while (col-- > 0)
resolve_const_item(thd, item_row->addr(col), comp_item_row->el(col));
}
else
else if (res_type == REAL_RESULT)
{ // It must REAL_RESULT
double result=item->val();
uint length=item->max_length,decimals=item->decimals;