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https://issues.apache.org/jira/browse/HIVE-3426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13551701#comment-13551701
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Shreepadma Venugopalan commented on HIVE-3426:
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Yup, let's try to optimize the simple case first. Optimizing subqueries with
GBY can be the next step.
> union with same source should be optimized
> ------------------------------------------
>
> Key: HIVE-3426
> URL: https://issues.apache.org/jira/browse/HIVE-3426
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Zhenxiao Luo
>
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