Github user srowen commented on the issue:
https://github.com/apache/spark/pull/22615
I guess we've just pinged @shaneknapp ! But I figured the jobs would simply
fail and could be removed at leisure.
Yes, this mechanism is a little weird but may be the simplest thing here. I
can add explicit init of those two flags to an empty string but an unset var is
just an empty string anyway.
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