Github user yanboliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/8866#discussion_r48591863
--- Diff: mllib/src/main/scala/org/apache/spark/ml/tree/treeParams.scala ---
@@ -252,6 +253,35 @@ private[ml] object TreeRegressorParams {
final val supportedImpurities: Array[String] =
Array("variance").map(_.toLowerCase)
}
+private[ml] trait DecisionTreeRegressorParams extends DecisionTreeParams
+ with TreeRegressorParams with HasVarianceCol {
+
+ /** @group setParam */
+ def setVarianceCol(value: String): this.type = set(varianceCol, value)
+
+ /**
+ * Validates and transforms the input schema with the provided param map.
+ * @param schema input schema
+ * @param fitting whether this is in fitting
+ * @param featuresDataType SQL DataType for FeaturesType.
+ * E.g.,
[[org.apache.spark.mllib.linalg.VectorUDT]] for vector features.
+ * @return output schema
+ */
+ override protected def validateAndTransformSchema(
+ schema: StructType,
+ fitting: Boolean,
+ featuresDataType: DataType): StructType = {
+ SchemaUtils.checkColumnType(schema, $(featuresCol), featuresDataType)
--- End diff --
Here we should handle ```varianceCol```, so it's different from the
parent's version.
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