Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11120#issuecomment-181896060
@hvanhovell @viirya Thank you for your reviews! Just added two test cases
for this, as suggested by @hvanhovell
Yeah. I did check the original Hive JIRA:
https://issues.apache.org/jira/browse/HIVE-9039 . The reason their parser added
this is that they do not added another `Distinct` above `Union All`.
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