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https://issues.apache.org/jira/browse/HIVE-7537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14129364#comment-14129364
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Matt McCline commented on HIVE-7537:
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This work was done in HIVE-7405.
> Output vectorized GROUP BY with only primitive aggregate fields as columns so
> downstream operators will be vectorized
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-7537
> URL: https://issues.apache.org/jira/browse/HIVE-7537
> Project: Hive
> Issue Type: Sub-task
> Reporter: Matt McCline
> Assignee: Matt McCline
>
> When under Tez engine, see if the VectorGroupByOperator aggregrates are all
> primitive (e.g. sum) and batch the output rows into a VectorizedRowBatch.
> And, vectorize downstream operators.
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