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a fix (Bug #3435: STDDEV|VARIANCE(constant) returns constant if no rows)

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unknown 2004-05-05 16:06:01 +05:00
parent 575541b9f7
commit 393ed84c9a
3 changed files with 18 additions and 0 deletions
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8
mysql-test/r/func_group.result
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@ -648,3 +648,11 @@ select a from t1 having a=1;
a a
1 1
drop table t1; drop table t1;
create table t1 (a int);
select variance(2) from t1;
variance(2)
NULL
select stddev(2) from t1;
stddev(2)
NULL
drop table t1;

9
mysql-test/t/func_group.test
View File

@ -387,3 +387,12 @@ insert into t1 values (1);
select max(a) as b from t1 having b=1; select max(a) as b from t1 having b=1;
select a from t1 having a=1; select a from t1 having a=1;
drop table t1; drop table t1;
#
# Bug #3435: variance(const), stddev(const) and an empty table
#
create table t1 (a int);
select variance(2) from t1;
select stddev(2) from t1;
drop table t1;

1
sql/item_sum.h
View File

@ -351,6 +351,7 @@ class Item_sum_variance : public Item_sum_num
void update_field(); void update_field();
Item *result_item(Field *field) Item *result_item(Field *field)
{ return new Item_variance_field(this); } { return new Item_variance_field(this); }
void no_rows_in_result() {}
const char *func_name() const { return "variance"; } const char *func_name() const { return "variance"; }
Item *copy_or_same(THD* thd); Item *copy_or_same(THD* thd);
}; };