Github user WeichenXu123 commented on a diff in the pull request: https://github.com/apache/spark/pull/19516#discussion_r146513000 --- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/ChiSqSelector.scala --- @@ -291,9 +291,13 @@ final class ChiSqSelectorModel private[ml] ( val featureAttributes: Array[Attribute] = if (origAttrGroup.attributes.nonEmpty) { origAttrGroup.attributes.get.zipWithIndex.filter(x => selector.contains(x._2)).map(_._1) } else { - Array.fill[Attribute](selector.size)(NominalAttribute.defaultAttr) + null --- End diff -- Instead of removing this, I think the better way is fill the `values` or `numValues` member here.
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