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Fix for bug #2629 NULLIF() doesn't behave as described in manual

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This commit is contained in:
gluh@gluh.mysql.r18.ru
2004-03-16 11:33:03 +04:00
parent 2bf78563f7
commit 86211a1b44
3 changed files with 15 additions and 3 deletions
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6
mysql-test/r/func_if.result
View File

@@ -40,6 +40,12 @@ a
aa
aaa
drop table t1;
select NULLIF(NULL,NULL), NULLIF(NULL,1), NULLIF(NULL,1.0), NULLIF(NULL,"test");
NULLIF(NULL,NULL) NULLIF(NULL,1) NULLIF(NULL,1.0) NULLIF(NULL,"test")
NULL NULL NULL NULL
select NULLIF(1,NULL), NULLIF(1.0, NULL), NULLIF("test", NULL);
NULLIF(1,NULL) NULLIF(1.0, NULL) NULLIF("test", NULL)
1 1.0 test
create table t1 (num double(12,2));
insert into t1 values (144.54);
select sum(if(num is null,0.00,num)) from t1;

6
mysql-test/t/func_if.test
View File

@@ -20,6 +20,12 @@ select if(u=1,binary st,st) s from t1 order by s;
select if(u=1,st,binary st) s from t1 where st like "%a%" order by s;
drop table t1;
#
# Bug 2629
#
select NULLIF(NULL,NULL), NULLIF(NULL,1), NULLIF(NULL,1.0), NULLIF(NULL,"test");
select NULLIF(1,NULL), NULLIF(1.0, NULL), NULLIF("test", NULL);
#
# Problem with IF()
#

6
sql/item_cmpfunc.cc
View File

@@ -616,7 +616,7 @@ double
Item_func_nullif::val()
{
double value;
if (!(this->*cmp_func)() || null_value)
if (!(this->*cmp_func)())
{
null_value=1;
return 0.0;
@@ -630,7 +630,7 @@ longlong
Item_func_nullif::val_int()
{
longlong value;
if (!(this->*cmp_func)() || null_value)
if (!(this->*cmp_func)())
{
null_value=1;
return 0;
@@ -644,7 +644,7 @@ String *
Item_func_nullif::val_str(String *str)
{
String *res;
if (!(this->*cmp_func)() || null_value)
if (!(this->*cmp_func)())
{
null_value=1;
return 0;