Github user viirya commented on the issue:
https://github.com/apache/spark/pull/17819
@WeichenXu123 According to
https://docs.oracle.com/javase/specs/jls/se7/html/jls-13.html#jls-13.4.4 and
https://wiki.eclipse.org/Evolving_Java-based_APIs_2#Evolving_API_Classes, I
think adding an interface to a class doesn't break binary compatibility.
I am not sure the exact reason of implementing setter methods for params in
concrete estimators/transformers. Maybe it is because some params should be
immutable in models.
Anyway, I will merge the inputCols stuff into existing `Bucketizer` if you
prefer this way.
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