Github user tovbinm commented on a diff in the pull request:
https://github.com/apache/spark/pull/20321#discussion_r162678515
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/classification/Classifier.scala ---
@@ -109,7 +109,7 @@ abstract class Classifier[
case None =>
// Get number of classes from dataset itself.
val maxLabelRow: Array[Row] =
dataset.select(max($(labelCol))).take(1)
- if (maxLabelRow.isEmpty) {
+ if (maxLabelRow.isEmpty || maxLabelRow(0).get(0) == null) {
--- End diff --
@dongjoon-hyun done.
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