Github user markhamstra commented on the issue: https://github.com/apache/spark/pull/16620 Thanks for all the investigation and the write up, @kayousterhout This makes good sense to me, and should take us a long way toward both fixing the immediate bug and improving the code. We should also make sure that our intentions and understanding get preserved in documentation that is more obvious and accessible in the future than PR discussion threads. Probably more comments in the source code that cover the essence of your "very long write up", but maybe we should consider creating an external documentation page (wiki or something) that covers in long form what we know and intend; then we can scale down the in-code comments to a shorter form that includes pointers to the long form.
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