Github user yinxusen commented on a diff in the pull request:
https://github.com/apache/spark/pull/11486#discussion_r56760149
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala
---
@@ -248,6 +248,18 @@ class RFormulaModel private[feature](
!columnNames.contains($(labelCol)) || schema($(labelCol)).dataType
== DoubleType,
"Label column already exists and is not of type DoubleType.")
}
+
+ /**
+ * Get the original array of labels if exists.
+ */
+ private[ml] def getOriginalLabels: Option[Array[String]] = {
--- End diff --
I'm rewriting it now.
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