Github user JoshRosen commented on the issue:
https://github.com/apache/spark/pull/21346
I'm going to be starting a more detailed review pass on this now and will
be getting caught back up with the discussion that's happened so far.
One high-level point I'd like to keep in mind: what are the major risks of
this change in terms of introducing performance or correctness issues? If we
identify risks (e.g. "this is a historically tricky area of code?"), can we
mitigate those risks through correctness testing / load testing?
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