BryanCutler commented on issue #26370: [SPARK-29727][ML][PYTHON] Use UnaryTransformer as parent class for single input column transformers in PySpark URL: https://github.com/apache/spark/pull/26370#issuecomment-549623783 >Thanks for your comment. Seems if I want to use UnaryTransformer as the parent class for DCT etc. , I will need to have a JavaUnaryTransformer, right? My point is why do you want to use the pyspark UnaryTransformer? Before, it would 'transformShema` and call the `udf` from Scala, which is ideal. With this change the pyspark `UnaryTransformer` does those in python and uses a python udf right?
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