Github user rxin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/4592#discussion_r24713028
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/GroupedData.scala ---
    @@ -46,6 +46,15 @@ class GroupedData protected[sql](df: DataFrameImpl, 
groupingExprs: Seq[Expressio
         }
       }
     
    +  @scala.annotation.varargs
    +  private[this] def aggregateNumericColumns(colName: String, colNames: 
String*)
    --- End diff --
    
    can you just remove the other aggregateNumericColumns and leave this one?
    
    Also for this one there is no need to use the annotation because it is not 
a public API.



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