Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/6433#discussion_r31171364
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/StandardScaler.scala ---
@@ -48,6 +48,16 @@ private[feature] trait StandardScalerParams extends
Params with HasInputCol with
* @group param
*/
val withStd: BooleanParam = new BooleanParam(this, "withStd", "Scale to
unit standard deviation")
+
+ protected def validateAndTransformSchema(schema: StructType): StructType
= {
+ val inputType = schema($(inputCol)).dataType
--- End diff --
This could be further simplified by using the SchemaUtils from `ml.util`.
See:
https://github.com/apache/spark/blob/836a75898fdc4b10d4d00676ef29e24cc96f09fd/mllib/src/main/scala/org/apache/spark/ml/feature/IDF.scala#L55
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