Laszlo Bodor created HIVE18823:

Summary: Vectorization: introduce qtest for SUM (IF/WHEN) with vectorization
for ORC
Key: HIVE18823
URL: https://issues.apache.org/jira/browse/HIVE18823
Project: Hive
Issue Type: Test
Components: Hive
Affects Versions: 2.3.0
Reporter: Laszlo Bodor
HIVE16110 introduced some issues when using SUM aggregations with WHEN clause.
As far as I can see, there is no separate qtests for validating that, vectorized_case is
quite close, but not the same.
The test case would be:
{code:java}
set hive.vectorized.execution.enabled=false;
drop table if exists vectorization_sum_if_when_a;
drop table if exists vectorization_sum_if_when_b;
create table vectorization_sum_if_when_a (x int) stored as orc;
insert into table vectorization_sum_if_when_a values (0), (1), (0), (NULL), (NULL), (NULL),
(NULL), (NULL), (NULL), (NULL);
create table vectorization_sum_if_when_b (x int) stored as orc;
insert into table vectorization_sum_if_when_b select least(t1.x + t2.x + t3.x + t4.x, 1) from
vectorization_sum_if_when_a t1, vectorization_sum_if_when_a t2, vectorization_sum_if_when_a
t3, vectorization_sum_if_when_a t4;
select count(*), x from vectorization_sum_if_when_b group by x;
select sum(IF(x is null, 1, 0)), count(1) from vectorization_sum_if_when_b;
select sum(IF(x=1, 1, 0)), count(1) from vectorization_sum_if_when_b;
select sum((case WHEN x = 1 THEN 1 else 0 end)) from vectorization_sum_if_when_b;
select sum((case WHEN x = 1 THEN 1 else 0 end)), sum((case WHEN x = 1 THEN 1 when x is null
then 0 else 0 end)) from vectorization_sum_if_when_b;
set hive.vectorized.execution.enabled=true;
select sum(IF(x is null, 1, 0)), count(1) from vectorization_sum_if_when_b;
select sum(IF(x=1, 1, 0)), count(1) from vectorization_sum_if_when_b;
select sum((case WHEN x = 1 THEN 1 else 0 end)) from vectorization_sum_if_when_b;
select sum((case WHEN x = 1 THEN 1 else 0 end)), sum((case WHEN x = 1 THEN 1 when x is null
then 0 else 0 end)) from vectorization_sum_if_when_b;
{code}

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