Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/21427
But we marked this as experimental. If we treat old API and new
experimental API in the same way, I wonder why we have them. One thing I am
less clear is, what kind of scenario we are worried of. I reread the discussion
here and I still don't know which case we are worried of breaking.
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