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https://issues.apache.org/jira/browse/HIVE-12290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14982264#comment-14982264
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Matt McCline commented on HIVE-12290:
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And thanks for do a quick measurement. 25% reduction isn't bad.
> Native Vector ReduceSink
> ------------------------
>
> Key: HIVE-12290
> URL: https://issues.apache.org/jira/browse/HIVE-12290
> Project: Hive
> Issue Type: Improvement
> Components: Hive
> Reporter: Matt McCline
> Assignee: Matt McCline
> Priority: Critical
> Attachments: HIVE-12290.01.patch, HIVE-12290.02.patch
>
>
> Currently, VectorReduceSinkOperator is a pass-thru to ReduceSinkOperator, so
> we incur object inspector costs.
> Native vectorization will not use object inspectors and allocate memory up
> front that will be reused for each batch.
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