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

    https://github.com/apache/spark/pull/4339#discussion_r24034165
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrameImpl.scala 
---
    @@ -141,7 +141,7 @@ private[sql] class DataFrameImpl protected[sql](
       }
     
       override def orderBy(sortCol: String, sortCols: String*): DataFrame = {
    -    sort(sortCol, sortCols :_*)
    +    orderBy(sortCol, sortCols :_*)
    --- End diff --
    
    Can you put the real types here instead? (i.e. `sortCols: String*`) as the 
flow here is super confusing.  Also I'd have most versions call `sort(sortCol: 
String, sortCols: String*)`, where the actual work is done.


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