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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