Github user srowen commented on the issue:
https://github.com/apache/spark/pull/22813
I don't know what else goes in the work dir. It isn't valid to reuse it for
anything else. Can you simply avoid using a work dir that is or has been used
by something else?
The argument for making this change anyway is just that the code should
delete just what it writes. But I am just not sure it can be something you rely
on for correct behavior
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