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BUG#12695: Item_func_isnull::update_used_tables did not update const_item_cache

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This commit is contained in:
serg@serg.mylan 2005-09-08 22:57:27 +02:00
parent 5fa2cea16f
commit a7f2179c29
3 changed files with 20 additions and 1 deletions
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9
mysql-test/r/group_by.result
View file

@ -764,3 +764,12 @@ select date(left(f1+0,8)) from t1 group by 1;
date(left(f1+0,8))
2005-06-06
drop table t1;
create table t1(f1 varchar(5) key);
insert into t1 values (1),(2);
select sql_buffer_result max(f1) is null from t1;
max(f1) is null
0
select sql_buffer_result max(f1)+1 from t1;
max(f1)+1
3
drop table t1;

10
mysql-test/t/group_by.test
View file

@ -600,4 +600,14 @@ insert into t1 values('2005-06-06');
select date(left(f1+0,8)) from t1 group by 1;
drop table t1;
#
# BUG#12695: Item_func_isnull::update_used_tables
# did not update const_item_cache
#
create table t1(f1 varchar(5) key);
insert into t1 values (1),(2);
select sql_buffer_result max(f1) is null from t1;
select sql_buffer_result max(f1)+1 from t1;
drop table t1;
# End of 4.1 tests

2
sql/item_cmpfunc.h
View file

@ -805,7 +805,7 @@ public:
else
{
args[0]->update_used_tables();
if (!(used_tables_cache=args[0]->used_tables()))
if ((const_item_cache= !(used_tables_cache= args[0]->used_tables())))
{
/* Remember if the value is always NULL or never NULL */
cached_value= (longlong) args[0]->is_null();