Pengcheng Xiong created HIVE-9039:
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Summary: Support Union Distinct
Key: HIVE-9039
URL: https://issues.apache.org/jira/browse/HIVE-9039
Project: Hive
Issue Type: New Feature
Reporter: Pengcheng Xiong
Current version (Hive 0.14) does not support union (or union distinct). It only
supports union all. In this patch, we try to add this new feature by rewriting
union distinct to union all followed by group by.
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