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https://issues.apache.org/jira/browse/SPARK-15688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yin Huai resolved SPARK-15688.
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Resolution: Won't Fix
https://github.com/apache/spark/pull/13483#issuecomment-224758653
> RelationalGroupedDataset.toDF should not add group by expressions that are
> already added in the aggregate expressions.
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-15688
> URL: https://issues.apache.org/jira/browse/SPARK-15688
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Yin Huai
>
> For {{df.groupBy("col").agg($"col", count("*"))`}}, it is kind of weird to
> have col appearing twice in the result. Seems we can avoid of output group by
> expressions twice if it already a part of {{agg}}. Looks like
> RelationalGroupedDataset.toDF is the place to change.
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