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

    https://github.com/apache/spark/pull/20706#discussion_r171927283
  
    --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
    @@ -1876,17 +1822,6 @@ private[spark] object Utils extends Logging {
         obj.getClass.getSimpleName.replace("$", "")
       }
     
    -  /** Return an option that translates JNothing to None */
    -  def jsonOption(json: JValue): Option[JValue] = {
    --- End diff --
    
    We should not be using json4s for new things, so it's better to have these 
hidden away.


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