Github user markhamstra commented on the pull request:
https://github.com/apache/spark/pull/999#issuecomment-46436035
Hmmm, that doesn't precisely match my recollection or understanding.
Certainly we discussed that alpha components aren't required to maintain a
stable API, but I don't recall an explicit decision that changes to alpha
components would routinely be merged back into maintenance releases. I could
be mistaken, and merging new alpha API into maintenance branches may be the
right strategy, but this did take me a little by surprise.
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