Github user mpjlu commented on a diff in the pull request:
https://github.com/apache/spark/pull/19516#discussion_r146741139
--- 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 --
Change the error description is ok, but ChiSqSelector maybe not the only
case causes this error. StringIndexer, QuantileDiscretizer may also causes this
error.
Maybe we need a solution for this problem?
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