Ngone51 commented on a change in pull request #27488:
[SPARK-26580][SQL][ML][FOLLOW-UP] Throw exception when use untyped UDF by
default
URL: https://github.com/apache/spark/pull/27488#discussion_r376267347
##########
File path: mllib/src/main/scala/org/apache/spark/ml/Transformer.scala
##########
@@ -79,7 +80,7 @@ abstract class Transformer extends PipelineStage {
* result as a new column.
*/
@DeveloperApi
-abstract class UnaryTransformer[IN, OUT, T <: UnaryTransformer[IN, OUT, T]]
+abstract class UnaryTransformer[IN: TypeTag, OUT: TypeTag, T <:
UnaryTransformer[IN, OUT, T]]
Review comment:
`TypeTag` is required for typed UDF when create udf for
`createTransformFunc`.
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