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From "Harish Butani (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-7063) Optimize for the Top N within a Group use case
Date Mon, 30 Jun 2014 01:35:25 GMT

     [ https://issues.apache.org/jira/browse/HIVE-7063?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harish Butani updated HIVE-7063:
--------------------------------

    Status: Patch Available  (was: Open)

> 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
>         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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