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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-11775) Implement limit push down through union all in CBO
Date Thu, 10 Sep 2015 00:14:45 GMT
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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