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https://issues.apache.org/jira/browse/HIVE-7063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13998389#comment-13998389
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Gopal V commented on HIVE-7063:
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This would be exceptionally useful - I have seen at least two implementations
of TOPN UDAFs for this.
> 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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