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

    https://github.com/apache/spark/pull/19278#discussion_r139809836
  
    --- Diff: mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala ---
    @@ -399,14 +399,17 @@ private[ml] object DefaultParamsReader {
        * This works if all Params implement 
[[org.apache.spark.ml.param.Param.jsonDecode()]].
        * TODO: Move to [[Metadata]] method
        */
    -  def getAndSetParams(instance: Params, metadata: Metadata): Unit = {
    +  def getAndSetParams(instance: Params, metadata: Metadata,
    +      skipParams: List[String] = null): Unit = {
    --- End diff --
    
    Use an `Option[List[String]]` that defaults to `None` instead of a 
`List[String]` that defaults to null?


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