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From "Jacques Nadeau (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-776) Support selection vector sv2 and sv4 in partition sender
Date Tue, 20 May 2014 16:03:06 GMT

    [ https://issues.apache.org/jira/browse/DRILL-776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14003540#comment-14003540
] 

Jacques Nadeau commented on DRILL-776:
--------------------------------------

e9ac37d

> Support selection vector sv2 and sv4 in partition sender 
> ---------------------------------------------------------
>
>                 Key: DRILL-776
>                 URL: https://issues.apache.org/jira/browse/DRILL-776
>             Project: Apache Drill
>          Issue Type: Improvement
>            Reporter: Jinfeng Ni
>            Assignee: Jinfeng Ni
>         Attachments: DRILL-776.1.patch
>
>
> Currently, Partition sender does not accept sv2 or sv4. If the incoming batch is sv2
or sv4, a SelectionVectorRemover (SVR) op is required to remove sv2 or sv4.   SVR is essentially
doing copy, while partition sender is doing copy as well. This would introduce unnecessary
copy to the whole query process.
> In stead, we should enhance Partition sender so that it could take sv2 and sv4 directly,
removing the SVR's copy overhead. This would improve the query performance in terms of cpu
and memory consumption.



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