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Posted to dev@drill.apache.org by "Aman Sinha (JIRA)" <ji...@apache.org> on 2014/05/19 19:48:38 UTC

[jira] [Commented] (DRILL-768) Support 2 phase COUNT aggregates

    [ https://issues.apache.org/jira/browse/DRILL-768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14002057#comment-14002057 ] 

Aman Sinha commented on DRILL-768:
----------------------------------

Reviewboard link :  https://reviews.apache.org/r/21638/

> Support 2 phase COUNT aggregates
> --------------------------------
>
>                 Key: DRILL-768
>                 URL: https://issues.apache.org/jira/browse/DRILL-768
>             Project: Apache Drill
>          Issue Type: Improvement
>            Reporter: Aman Sinha
>            Assignee: Aman Sinha
>         Attachments: 0001-Fix-DRILL-768-Support-2-phase-COUNT-aggregates.patch
>
>
> Drill currently supports 2 phase aggregation for SUM, MIN, MAX.  This enhancement is to support 2 phase COUNT aggregates.   In Phase 1 we will do partial count.  In Phase 2 we need to sum the partial counts to produce the final count.  



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