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

    https://github.com/apache/spark/pull/19666#discussion_r149242575
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/tree/impl/RandomForest.scala ---
    @@ -976,6 +930,44 @@ private[spark] object RandomForest extends Logging {
         categories
       }
     
    +  private[tree] def traverseUnorderedSplits[T](
    --- End diff --
    
    Also, does `traverseUnorderedSplits` need to take a type parameter / two 
different closures as method arguments? AFAICT the use of a type 
parameter/closures here allow us to unit test this functionality on a simple 
example, but I wonder if we could simplify this somehow.


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