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From "Chaoyu Tang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-12840) stats optimize subqueries whenever possible in a union query
Date Tue, 12 Jan 2016 01:26:39 GMT
Chaoyu Tang created HIVE-12840:
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             Summary: stats optimize subqueries whenever possible in a union query
                 Key: HIVE-12840
                 URL: https://issues.apache.org/jira/browse/HIVE-12840
             Project: Hive
          Issue Type: Improvement
          Components: Logical Optimizer
            Reporter: Chaoyu Tang


HIVE-12788 addressed a data incorrect issue in union query with aggregate function when stats
optimization is enabled. It won't stats optimize a query if any of its subqueries can not
be. 
[~pxiong] suggested an enhancement to leverage the stats optimizer whenever possible (even
only for a branch of a union), and we need investigate the possible solution.



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