Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/12157#discussion_r59787409
--- Diff: mllib/src/main/scala/org/apache/spark/ml/tree/Split.scala ---
@@ -145,6 +147,11 @@ final class CategoricalSplit private[ml] (
private def setComplement(cats: Set[Double]): Set[Double] = {
Range(0, numCategories).map(_.toDouble).filter(cat =>
!cats.contains(cat)).toSet
}
+
+ override def hashCode(): Int = {
+ val state = Seq(isLeft, categories, featureIndex, numCategories)
--- End diff --
This could go near `equals`. You're using an extra field not used in
equals. It may work out OK but maybe easier to make them match.
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