Github user KevinGrealish commented on the issue:
https://github.com/apache/spark/pull/13824
Unit tests involving env vars can get ugly:
[http://stackoverflow.com/questions/318239/how-do-i-set-environment-variables-from-java](http://stackoverflow.com/questions/318239/how-do-i-set-environment-variables-from-java).
I'm assuming such hacks would not be acceptable in this codebase.
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