Pengcheng Xiong created HIVE-11775:
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Summary: Implement limit push down through union all in CBO
Key: HIVE-11775
URL: https://issues.apache.org/jira/browse/HIVE-11775
Project: Hive
Issue Type: New Feature
Reporter: Pengcheng Xiong
Assignee: Pengcheng Xiong
Enlightened by HIVE-11684 (Kudos to [~jcamachorodriguez]), we can actually push
limit down through union all, which reduces the intermediate number of rows in
union branches.
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