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func_if.result, func_if.test:

Browse Source 
Added a test case for bug #11142.
item_cmpfunc.cc:
  Fixed bug #11142.
  Implementation of Item_func_nullif::is_null was corrected.
This commit is contained in:
igor@igor-inspiron.creware.com
2005-06-13 11:24:26 -07:00
parent 36ff674468
commit 42271e4240
3 changed files with 55 additions and 3 deletions
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27
mysql-test/r/func_if.result
View File

@ -86,3 +86,30 @@ drop table t1;
SELECT NULLIF(5,5) IS NULL, NULLIF(5,5) IS NOT NULL;
NULLIF(5,5) IS NULL NULLIF(5,5) IS NOT NULL
1 0
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a CHAR(10));
INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb');
SELECT a, NULLIF(a,'') FROM t1;
a NULLIF(a,'')
aaa aaa
NULL NULL
NULL
bbb bbb
SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL;
a NULLIF(a,'')
NULL NULL
NULL
DROP TABLE t1;
CREATE TABLE t1 (a CHAR(10));
INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb');
SELECT a, NULLIF(a,'') FROM t1;
a NULLIF(a,'')
aaa aaa
NULL NULL
NULL
bbb bbb
SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL;
a NULLIF(a,'')
NULL NULL
NULL
DROP TABLE t1;

27
mysql-test/t/func_if.test
View File

@ -60,3 +60,30 @@ drop table t1;
# Bug #5595 NULLIF() IS NULL returns false if NULLIF() returns NULL
#
SELECT NULLIF(5,5) IS NULL, NULLIF(5,5) IS NOT NULL;
#
# Test to check evaluation of MULLIF when the first argument is NULL
# (motivated by the Bug 11142)
#
--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings
CREATE TABLE t1 (a CHAR(10));
INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb');
SELECT a, NULLIF(a,'') FROM t1;
SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL;
DROP TABLE t1;
#
# Test for bug #11142: evaluation of NULLIF when the first argument is NULL
#
CREATE TABLE t1 (a CHAR(10));
INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb');
SELECT a, NULLIF(a,'') FROM t1;
SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL;
DROP TABLE t1;

4
sql/item_cmpfunc.cc
View File

@ -1161,9 +1161,7 @@ Item_func_nullif::val_str(String *str)
bool
Item_func_nullif::is_null()
{
if (!cmp.compare())
return (null_value=1);
return 0;
return (null_value= (!cmp.compare() ? 1 : args[0]->null_value));
}
/*