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From "Deneche A. Hakim (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-1908) new window function implementation
Date Wed, 21 Jan 2015 05:39:34 GMT

    [ https://issues.apache.org/jira/browse/DRILL-1908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14285200#comment-14285200
] 

Deneche A. Hakim commented on DRILL-1908:
-----------------------------------------

This patch only supports phase 1 (DRILL-1452) for now. The design was done with phase 2 in
mind (DRILL-1453), so it wouldn't take long to get that feature supported as well.
The main limitation is in the way window frames are aggregated, for each row the record batch
recomputes the row's frame and aggregates all rows that are part of this frame. This is not
the most efficient way to do this, and will probably require further optimisation later on.

> new window function implementation
> ----------------------------------
>
>                 Key: DRILL-1908
>                 URL: https://issues.apache.org/jira/browse/DRILL-1908
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Execution - Operators
>    Affects Versions: 0.7.0
>            Reporter: Deneche A. Hakim
>            Assignee: Deneche A. Hakim
>            Priority: Critical
>             Fix For: Future
>
>         Attachments: DRILL-1908.1.patch.txt, DRILL-1908.2.patch.txt
>
>
> In order to fix DRILL-1487 a complete rewrite of the StreamingWindowFrameRecordBatch
may be needed. The purpose of this issue is to report my progress and share my thoughts with
the community in order to get a proper implementation



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