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Fix for BUG#8711: "<=>" may have true value for NULL arguments, so make

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Item_func_equal::not_null_tables() always return 0.
This commit is contained in:
sergefp@mysql.com 2005-03-11 02:17:03 +03:00
parent 4559fb998b
commit 5d865045c9
3 changed files with 34 additions and 0 deletions
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20
mysql-test/r/join_outer.result
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@ -684,3 +684,23 @@ t1 ALL NULL NULL NULL NULL 3
t2 ALL NULL NULL NULL NULL 2
t3 ALL NULL NULL NULL NULL 2
drop table t1, t2, t3;
create table t1 (
a int(11),
b char(10),
key (a)
);
insert into t1 (a) values (1),(2),(3),(4);
create table t2 (a int);
select * from t1 left join t2 on t1.a=t2.a where not (t2.a <=> t1.a);
a b a
1 NULL NULL
2 NULL NULL
3 NULL NULL
4 NULL NULL
select * from t1 left join t2 on t1.a=t2.a having not (t2.a <=> t1.a);
a b a
1 NULL NULL
2 NULL NULL
3 NULL NULL
4 NULL NULL
drop table t1,t2;

13
mysql-test/t/join_outer.test
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@ -450,3 +450,16 @@ select * from t1 left join t2 on b1 = a1 left join t3 on c1 = a1 and b1 is
explain select * from t1 left join t2 on b1 = a1 left join t3 on c1 = a1 and b1 is null;
drop table t1, t2, t3;
# Test for BUG#8711 '<=>' was considered to be a NULL-rejecting predicate.
create table t1 (
a int(11),
b char(10),
key (a)
);
insert into t1 (a) values (1),(2),(3),(4);
create table t2 (a int);
select * from t1 left join t2 on t1.a=t2.a where not (t2.a <=> t1.a);
select * from t1 left join t2 on t1.a=t2.a having not (t2.a <=> t1.a);
drop table t1,t2;

1
sql/item_cmpfunc.h
View File

@ -78,6 +78,7 @@ public:
Item_func_equal(Item *a,Item *b) :Item_bool_func2(a,b) { };
longlong val_int();
void fix_length_and_dec();
table_map not_null_tables() const { return 0; }
enum Functype functype() const { return EQUAL_FUNC; }
enum Functype rev_functype() const { return EQUAL_FUNC; }
cond_result eq_cmp_result() const { return COND_TRUE; }