[jira] [Created] (SPARK-15688) RelationalGroupedDataset.toDF should not add group by expressions that are already added in the aggregate expressions.

["Yin Huai (JIRA)" <ji...@apache.org>]

Yin Huai created SPARK-15688:
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             Summary: 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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