Wang Yan created HIVE-20319:
-------------------------------
Summary: group by and union all always generate empty query result
Key: HIVE-20319
URL: https://issues.apache.org/jira/browse/HIVE-20319
Project: Hive
Issue Type: Bug
Components: Query Processor
Affects Versions: 2.3.2
Reporter: Wang Yan
The following query always generates empty results which is wrong.
{code:sql}
create table if not exists test_table(column1 string, column2 int);
insert into test_table values('a',1),('b',2);
set hive.optimize.union.remove=true;
select column1 from test_table group by column1
union all
select column1 from test_table group by column1;
{code}
Actual result : empty
Expected result:
{code}
a
b
a
b
{code}
Note that when correct result is generated when set
hive.optimize.union.remove=false.
It seems like the fix in https://issues.apache.org/jira/browse/HIVE-12788 is
insufficient.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
