Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/11218#issuecomment-206686765
@MLnick We might be able to provide a standard implementation, but we would
need to use Catalyst's ScalaReflection methods since ```inputType``` is a
Catalyst DataType but ```classOf[IN]``` is a Scala class. We also might have
to override it in a few cases, such as transformers which should accept all
NumericTypes.
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