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Posted to dev@hive.apache.org by "Harish Butani (JIRA)" <ji...@apache.org> on 2014/05/14 23:55:24 UTC

[jira] [Created] (HIVE-7063) Optimize for the Top N within a Group use case

Harish Butani created HIVE-7063:
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             Summary: Optimize for the Top N within a Group use case
                 Key: HIVE-7063
                 URL: https://issues.apache.org/jira/browse/HIVE-7063
             Project: Hive
          Issue Type: Bug
            Reporter: Harish Butani
            Assignee: Harish Butani


It is common to rank within a Group/Partition and then only return the Top N entries within each Group.
With Streaming mode for Windowing, we should push the post filter on the rank into the Windowing processing as a Limit expression.



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