Github user marmbrus commented on the issue:
https://github.com/apache/spark/pull/14170
Oh, I see what you are saying, although I'm not sure I agree with the
conclusion. Given that tests can run in parallel I don't think you actually
want to toggle back and forth between timezones. I actually think that was
causing the flakeyness we are trying to fix.
In contrast, setting the default timezone to something fixed across all
suites in Spark is idempotent. So, if any suite that cares about the default
timezone just sets it to `LA` you should be fine even in the face of
concurrency.
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