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https://issues.apache.org/jira/browse/SPARK-13798?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li closed SPARK-13798.
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Resolution: Later
> Replace Aggregate by Project if no Aggregate Function exists
> ------------------------------------------------------------
>
> Key: SPARK-13798
> URL: https://issues.apache.org/jira/browse/SPARK-13798
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Xiao Li
>
> If the Aggregate does not have any aggregate expression, it is useless. We
> can replace Aggregate by Project.
> Then, Project can be collapsed or pushed down further.
> This only makes sense when the grouping and aggregate are identical. Thus,
> will do it later
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