Github user hvanhovell commented on the pull request:
https://github.com/apache/spark/pull/9642#issuecomment-156721678
So I have been making a lot of fuss about internal classes, which you are
not touching. Sorry about that.
This change is much more benign, but I still wonder if you need to start
throwing ```NPE```'s. I'd prefer to update the documentation.
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