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https://issues.apache.org/jira/browse/HIVE-10005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14368229#comment-14368229
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Gunther Hagleitner commented on HIVE-10005:
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[~gopalv] can you take a look?
> remove some unnecessary branches from the inner loop
> ----------------------------------------------------
>
> Key: HIVE-10005
> URL: https://issues.apache.org/jira/browse/HIVE-10005
> Project: Hive
> Issue Type: Bug
> Reporter: Gunther Hagleitner
> Assignee: Gunther Hagleitner
> Attachments: HIVE-10005.1.patch, HIVE-10005.2.patch
>
>
> Operator.forward is doing too much. There's no reason to do the "done"
> checking per row and update it inline. It's much more efficient to just do
> that when the event that completes an operator happens.
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