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https://issues.apache.org/jira/browse/HIVE-20821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16665686#comment-16665686
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Gopal V commented on HIVE-20821:
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LGTM +1 - tests pending
> Rewrite SUM0 into SUM + COALESCE combination
> --------------------------------------------
>
> Key: HIVE-20821
> URL: https://issues.apache.org/jira/browse/HIVE-20821
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Attachments: HIVE-20821.patch
>
>
> Since SUM0 is not vectorized, but SUM + COALESCE are.
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