Github user yinxusen commented on the pull request:
https://github.com/apache/spark/pull/5980#issuecomment-100038557
I think `Bucketizer` should not extend `UnaryTransformer`, since we need it
as a model produced by some feature discretizer. UnaryTransformer does not meet
the type constraint `[M <: Model[M]]`.
E.g. in `QuantileDiscretizer`, I need this:
```scala
final class QuantileDiscretizer extends Estimator[Bucketizer] with
QuantileDiscretizerBase {
override def fit(dataset: DataFrame): Bucketizer = {
...
}
```
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