Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/3099#issuecomment-62675400
How about just taking a `PipelineStage` as the argument ? We can check
internally if it is an Estimator and if so check if it matches. Does that work
?
While I see you point about getting feedback, I'm just trying to make sure
we stick to the goal of exposing a user API and not exposing a developer API
[which as far as I can see there is consensus on ?]
So given this goal, all I am asking is that we write the API to match this
goal.
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