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Posted to dev@hive.apache.org by "Lefty Leverenz (JIRA)" <ji...@apache.org> on 2014/11/11 21:44:34 UTC

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

    [ https://issues.apache.org/jira/browse/HIVE-7063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14207019#comment-14207019 ] 

Lefty Leverenz commented on HIVE-7063:
--------------------------------------

Pinging [~rhbutani]:  No doc needed for this optimization?

> 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
>             Fix For: 0.14.0
>
>         Attachments: HIVE-7063.1.patch, HIVE-7063.2.patch, HIVE-7063.3.patch
>
>
> 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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