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

    https://github.com/apache/spark/pull/5818#discussion_r29464396
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
    @@ -852,6 +852,27 @@ class DataFrame private[sql](
       }
     
       /**
    +   * Returns a new [[DataFrame]] with a column dropped.
    +   * @group dfops
    +   */
    +  def drop(col: String, cols: String*): DataFrame = {
    --- End diff --
    
    Let's support dropping one column for now, and we can add other things in 
the future. We need to be extra careful when we add varargs, because they make 
it very hard to extend.



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