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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