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https://issues.apache.org/jira/browse/HIVE-13713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15308899#comment-15308899
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Matt McCline commented on HIVE-13713:
-------------------------------------
I messed up. It doesn't need to be in branch-2.1
> 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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