Github user sethah commented on the issue:
https://github.com/apache/spark/pull/15435
I mean that I thought we would put all the method implementations in the
traits, so that the `Impl` classes only have to extend them and not implement
anything themselves. So, the impl class would just be
````scala
class LogisticRegressionSummaryImpl private[classification](
@Since("2.2.0") @transient override val predictions: DataFrame,
@Since("2.2.0") override val probabilityCol: String,
@Since("2.2.0") override val predictionCol: String,
@Since("2.2.0") override val labelCol: String,
@Since("2.2.0") override val featuresCol: String)
extends LogisticRegressionSummary
````
without a class body.
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