Github user mallman commented on the issue:
https://github.com/apache/spark/pull/21889
>> @mallman, while we wait for the go-no-go, do you have the changes for
the next PR ready? Is there anything you need help with?
> I have the hack I used originally, but I haven't tried finding a better
solution yet. It could take some time to understand the underlying
problem/incompatibility/misunderstanding/etc.
I spent some time yesterday digging deeper into why the hack I wrote
worked, and I think I understand now. Practically speaking, my follow-on PR
will be about the same as the commit I removed. However, I can support it with
some explanatory comments instead of just "this throws an exception sometimes".
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