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func_str.result, null.result:

Browse source 
Corrected results after the fix for bug #12791.
func_test.result, func_test.test:
  Added test cases for bug #12791.
item_func.h, item_func.cc:
  Fixed bug #12791.
  Made LEAST/GREATES fully Oracle compliant.
  LEAST/GREATEST did not return NULL if only some
  arguments were NULLs. This did not comply with Oracle.
This commit is contained in:
igor@rurik.mysql.com 2005-08-26 22:25:45 -07:00
parent 0c3c6f8003
commit f93e7cc77a
6 changed files with 49 additions and 32 deletions
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2
mysql-test/r/func_str.result
View file

@ -287,7 +287,7 @@ lpad('STRING', 20, CONCAT('p','a','d') )
padpadpadpadpaSTRING
select LEAST(NULL,'HARRY','HARRIOT',NULL,'HAROLD'),GREATEST(NULL,'HARRY','HARRIOT',NULL,'HAROLD');
LEAST(NULL,'HARRY','HARRIOT',NULL,'HAROLD') GREATEST(NULL,'HARRY','HARRIOT',NULL,'HAROLD')
HAROLD HARRY
NULL NULL
select least(1,2,3) | greatest(16,32,8), least(5,4)*1,greatest(-1.0,1.0)*1,least(3,2,1)*1.0,greatest(1,1.1,1.0),least("10",9),greatest("A","B","0");
least(1,2,3) | greatest(16,32,8) least(5,4)*1 greatest(-1.0,1.0)*1 least(3,2,1)*1.0 greatest(1,1.1,1.0) least("10",9) greatest("A","B","0")
33 4 1.0 1.0 1.1 9 B

13
mysql-test/r/func_test.result
View file

@ -166,7 +166,6 @@ CREATE TABLE t2 ( access_id smallint(6) NOT NULL default '0', name varchar(20
INSERT INTO t2 VALUES (1,'Everyone',2),(2,'Help',3),(3,'Customer Support',1);
SELECT f_acc.rank, a1.rank, a2.rank FROM t1 LEFT JOIN t1 f1 ON (f1.access_id=1 AND f1.faq_group_id = t1.faq_group_id) LEFT JOIN t2 a1 ON (a1.access_id = f1.access_id) LEFT JOIN t1 f2 ON (f2.access_id=3 AND f2.faq_group_id = t1.faq_group_id) LEFT JOIN t2 a2 ON (a2.access_id = f2.access_id), t2 f_acc WHERE LEAST(a1.rank,a2.rank) = f_acc.rank;
rank rank rank
2 2 NULL
DROP TABLE t1,t2;
CREATE TABLE t1 (d varchar(6), k int);
INSERT INTO t1 VALUES (NULL, 2);
@ -193,3 +192,15 @@ select * from t1 where a not between 1 and 2 and b not between 3 and 4;
a b
4 5
drop table t1;
SELECT GREATEST(1,NULL) FROM DUAL;
GREATEST(1,NULL)
NULL
SELECT LEAST('xxx','aaa',NULL,'yyy') FROM DUAL;
LEAST('xxx','aaa',NULL,'yyy')
NULL
SELECT LEAST(1.1,1.2,NULL,1.0) FROM DUAL;
LEAST(1.1,1.2,NULL,1.0)
NULL
SELECT GREATEST(1.5E+2,1.3E+2,NULL) FROM DUAL;
GREATEST(1.5E+2,1.3E+2,NULL)
NULL

8
mysql-test/r/null.result
View file

@ -236,10 +236,10 @@ t1 CREATE TABLE `t1` (
`c06` varchar(6) character set latin2 default NULL,
`c07` varchar(6) character set latin2 default NULL,
`c08` varchar(6) character set latin2 default NULL,
`c09` varchar(6) character set latin2 NOT NULL default '',
`c10` varchar(6) character set latin2 NOT NULL default '',
`c11` varchar(6) character set latin2 NOT NULL default '',
`c12` varchar(6) character set latin2 NOT NULL default '',
`c09` varchar(6) character set latin2 default NULL,
`c10` varchar(6) character set latin2 default NULL,
`c11` varchar(6) character set latin2 default NULL,
`c12` varchar(6) character set latin2 default NULL,
`c13` varchar(6) character set latin2 default NULL,
`c14` char(0) character set latin2 default NULL,
`c15` char(0) character set latin2 default NULL,

9
mysql-test/t/func_test.test
View file

@ -118,3 +118,12 @@ insert into t1 values (1,2), (2,3), (3,4), (4,5);
select * from t1 where a not between 1 and 2;
select * from t1 where a not between 1 and 2 and b not between 3 and 4;
drop table t1;
#
# Test for bug #12791: one of the arguments of LEAST/GREATEST is NULL
#
SELECT GREATEST(1,NULL) FROM DUAL;
SELECT LEAST('xxx','aaa',NULL,'yyy') FROM DUAL;
SELECT LEAST(1.1,1.2,NULL,1.0) FROM DUAL;
SELECT GREATEST(1.5E+2,1.3E+2,NULL) FROM DUAL;

48
sql/item_func.cc
View file

@ -1950,7 +1950,7 @@ void Item_func_min_max::fix_length_and_dec()
int max_int_part=0;
decimals=0;
max_length=0;
maybe_null=1;
maybe_null=0;
cmp_type=args[0]->result_type();
for (uint i=0 ; i < arg_count ; i++)
@ -1958,8 +1958,8 @@ void Item_func_min_max::fix_length_and_dec()
set_if_bigger(max_length, args[i]->max_length);
set_if_bigger(decimals, args[i]->decimals);
set_if_bigger(max_int_part, args[i]->decimal_int_part());
if (!args[i]->maybe_null)
maybe_null=0;
if (args[i]->maybe_null)
maybe_null=1;
cmp_type=item_cmp_type(cmp_type,args[i]->result_type());
}
if (cmp_type == STRING_RESULT)
@ -2005,14 +2005,11 @@ String *Item_func_min_max::val_str(String *str)
{
String *res;
LINT_INIT(res);
null_value=1;
null_value= 0;
for (uint i=0; i < arg_count ; i++)
{
if (null_value)
{
if (i == 0)
res=args[i]->val_str(str);
null_value=args[i]->null_value;
}
else
{
String *res2;
@ -2023,7 +2020,11 @@ String *Item_func_min_max::val_str(String *str)
if ((cmp_sign < 0 ? cmp : -cmp) < 0)
res=res2;
}
else
res= 0;
}
if ((null_value= args[i]->null_value))
break;
}
if (res) // If !NULL
res->set_charset(collation.collation);
@ -2043,20 +2044,19 @@ double Item_func_min_max::val_real()
{
DBUG_ASSERT(fixed == 1);
double value=0.0;
null_value=1;
null_value= 0;
for (uint i=0; i < arg_count ; i++)
{
if (null_value)
{
if (i == 0)
value= args[i]->val_real();
null_value=args[i]->null_value;
}
else
{
double tmp= args[i]->val_real();
if (!args[i]->null_value && (tmp < value ? cmp_sign : -cmp_sign) > 0)
value=tmp;
}
if ((null_value= args[i]->null_value))
break;
}
return value;
}
@ -2066,20 +2066,19 @@ longlong Item_func_min_max::val_int()
{
DBUG_ASSERT(fixed == 1);
longlong value=0;
null_value=1;
null_value= 0;
for (uint i=0; i < arg_count ; i++)
{
if (null_value)
{
if (i == 0)
value=args[i]->val_int();
null_value=args[i]->null_value;
}
else
{
longlong tmp=args[i]->val_int();
if (!args[i]->null_value && (tmp < value ? cmp_sign : -cmp_sign) > 0)
value=tmp;
}
if ((null_value= args[i]->null_value))
break;
}
return value;
}
@ -2089,20 +2088,17 @@ my_decimal *Item_func_min_max::val_decimal(my_decimal *dec)
{
DBUG_ASSERT(fixed == 1);
my_decimal tmp_buf, *tmp, *res= NULL;
null_value=1;
null_value= 0;
for (uint i=0; i < arg_count ; i++)
{
if (null_value)
{
if (i == 0)
res= args[i]->val_decimal(dec);
null_value= args[i]->null_value;
}
else
{
tmp= args[i]->val_decimal(&tmp_buf);
if (args[i]->null_value)
continue;
if ((my_decimal_cmp(tmp, res) * cmp_sign) < 0)
res= 0;
else if ((my_decimal_cmp(tmp, res) * cmp_sign) < 0)
{
if (tmp == &tmp_buf)
{
@ -2113,6 +2109,8 @@ my_decimal *Item_func_min_max::val_decimal(my_decimal *dec)
res= tmp;
}
}
if ((null_value= args[i]->null_value))
break;
}
return res;
}

1
sql/item_func.h
View file

@ -682,7 +682,6 @@ public:
my_decimal *val_decimal(my_decimal *);
void fix_length_and_dec();
enum Item_result result_type () const { return cmp_type; }
table_map not_null_tables() const { return 0; }
};
class Item_func_min :public Item_func_min_max