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https://issues.apache.org/jira/browse/HIVE-6192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13870020#comment-13870020
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Ashutosh Chauhan commented on HIVE-6192:
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RB request : https://reviews.apache.org/r/16829/
> Optimize sum(1) to answer query using metadata
> ----------------------------------------------
>
> Key: HIVE-6192
> URL: https://issues.apache.org/jira/browse/HIVE-6192
> Project: Hive
> Issue Type: New Feature
> Components: Query Processor, Statistics
> Reporter: Ashutosh Chauhan
> Assignee: Ashutosh Chauhan
> Attachments: HIVE-6192.patch
>
>
> sum(1) has same semantics as count(1) so it can also be optimized in similar
> fashion by answering query using stats stored in metastore.
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