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Bug #37761: IN handles NULL differently for table-subquery

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and value-list

The server returns unexpected results if a right side of the 
NOT IN clause consists of NULL value and some constants of
the same type, for example:

  SELECT * FROM t WHERE NOT t.id IN (NULL, 1, 2) 
  
may return 3, 4, 5 etc if a table contains these values.


The Item_func_in::val_int method has been modified:
unnecessary resets of an Item_func_case::has_null field 
value has been moved outside of an argument comparison
loop. (Also unnecessary re-initialization of the null_value
field has been moved).
This commit is contained in:
Gleb Shchepa 2008-07-14 14:06:49 +05:00
parent 6d05a62e4a
commit 211164ff8c
3 changed files with 18 additions and 3 deletions
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6
mysql-test/r/func_in.result
View File

@ -569,4 +569,10 @@ insert into t1 values (),(),(),(),(),(),(),(),(),();
select a from t1 where a not in (a,a,a) group by a;
a
drop table t1;
create table t1 (id int);
select * from t1 where NOT id in (select null union all select 1);
id
select * from t1 where NOT id in (null, 1);
id
drop table t1;
End of 5.1 tests

9
mysql-test/t/func_in.test
View File

@ -417,4 +417,13 @@ insert into t1 values (),(),(),(),(),(),(),(),(),();
select a from t1 where a not in (a,a,a) group by a;
drop table t1;
#
# Bug #37761: IN handles NULL differently for table-subquery and value-list
#
create table t1 (id int);
select * from t1 where NOT id in (select null union all select 1);
select * from t1 where NOT id in (null, 1);
drop table t1;
--echo End of 5.1 tests

6
sql/item_cmpfunc.cc
View File

@ -3758,6 +3758,9 @@ longlong Item_func_in::val_int()
return (longlong) (!null_value && tmp != negated);
}
if ((null_value= args[0]->null_value))
return 0;
have_null= 0;
for (uint i= 1 ; i < arg_count ; i++)
{
Item_result cmp_type= item_cmp_type(left_result_type, args[i]->result_type());
@ -3766,9 +3769,6 @@ longlong Item_func_in::val_int()
if (!(value_added_map & (1 << (uint)cmp_type)))
{
in_item->store_value(args[0]);
if ((null_value=args[0]->null_value))
return 0;
have_null= 0;
value_added_map|= 1 << (uint)cmp_type;
}
if (!in_item->cmp(args[i]) && !args[i]->null_value)