Github user dbtsai commented on the pull request:
https://github.com/apache/spark/pull/6339#issuecomment-126519222
Are we going to have `invert` or `unapply` in the `Transformer` trait? In
scala, there is an extractor pattern
http://docs.scala-lang.org/tutorials/tour/extractor-objects.html , and unapply
will return `Option` since some of the transformation is one way. But `Option`
will not be friendly for Java.
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