cen yuhai created SPARK-22491:
---------------------------------
Summary: union all can't execute parallel with group by
Key: SPARK-22491
URL: https://issues.apache.org/jira/browse/SPARK-22491
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.1.2
Reporter: cen yuhai
test sql
```sql
create table temp.test_yuhai_group
as
select
city_name
,sum(amount)
from temp.table_01
group by city_name
union all
select
city_name
,sum(amount)
from temp.table_01
group by city_name
union all
select city_name
,sum(amount)
from temp.table_01
group by city_name
```
if I remove group by ,it is ok
```sql
create table temp.test_yuhai_group
as
select
city_name
from temp.table_01
union all
select
city_name
from temp.table_01
union all
select city_name
from temp.table_01
```
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