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Date: Tue, 31 May 2016 02:05:12 +0000 (UTC)
From: "Matt McCline (JIRA)" <jira@apache.org>
To: issues@hive.apache.org
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Subject: [jira] [Updated] (HIVE-13713) We miss vectorization in a case of
 count(*) when aggregation mode is COMPLETE
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archived-at: Tue, 31 May 2016 02:05:14 -0000


     [ https://issues.apache.org/jira/browse/HIVE-13713?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matt McCline updated HIVE-13713:
--------------------------------
    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

> We miss vectorization in a case of count(*) when aggregation mode is COMPLETE
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-13713
>                 URL: https://issues.apache.org/jira/browse/HIVE-13713
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>            Priority: Critical
>             Fix For: 2.1.0, 2.2.0
>
>         Attachments: HIVE-13713.01.patch, HIVE-13713.02.patch, HIVE-13713.03.patch
>
>
> E.g. vectorization_limit.q doesn't vectorize Reducer 2 for the query:
> {code}
> "select ctinyint, count(distinct(cdouble)) from alltypesorc group by ctinyint order by ctinyint limit 20"
> {code}
> It was producing a stack trace with this error... when trying to vectorize the COMPLETE mode GROUP BY operator.
> {code}
> Vector aggregate not implemented: "count" for type: "NONE (reduce-merge-partial = true)
> {code}


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