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Fix for bug #5595: NULLIF() IS NULL returns false if NULLIF() returns NULL

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This commit is contained in:
gluh@gluh.mysql.r18.ru
2004-09-18 13:06:44 +04:00
parent 0b6dc49388
commit 276622c92d
4 changed files with 17 additions and 0 deletions
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3
mysql-test/r/func_if.result
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@ -64,3 +64,6 @@ select if(1>2,a,avg(a)) from t1;
if(1>2,a,avg(a))
1.5000
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

4
mysql-test/t/func_if.test
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@ -47,3 +47,7 @@ insert t1 values (1),(2);
select if(1>2,a,avg(a)) from t1;
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;

9
sql/item_cmpfunc.cc
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@ -654,6 +654,15 @@ Item_func_nullif::val_str(String *str)
return res;
}
bool
Item_func_nullif::is_null()
{
if (!(this->*cmp_func)())
return null_value=1;
return 0;
}
/*
CASE expression
Return the matching ITEM or NULL if all compares (including else) failed

1
sql/item_cmpfunc.h
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@ -240,6 +240,7 @@ public:
void fix_length_and_dec();
const char *func_name() const { return "nullif"; }
table_map not_null_tables() const { return 0; }
bool is_null();
};