Chao created HIVE-8920:
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Summary: SplitSparkWorkResolver doesn't work with UnionWork
Key: HIVE-8920
URL: https://issues.apache.org/jira/browse/HIVE-8920
Project: Hive
Issue Type: Sub-task
Components: Spark
Affects Versions: spark-branch
Reporter: Chao
The following query will not work:
{code}
from (select * from table0 union all select * from table1) s
insert overwrite table table3 select s.x, count(1) group by s.x
insert overwrite table table4 select s.y, count(1) group by s.y;
{code}
Currently, the plan for this query, before SplitSparkWorkResolver, looks like
below:
{noformat}
M1 M2
\ / \
U3 R5
|
R4
{noformat}
In {{SplitSparkWorkResolver#splitBaseWork}}, it assumes that the {{childWork}}
is a ReduceWork, but for this case, you can see that for M2 the childWork could
be UnionWork U3. Thus, the code will fail.
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