Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/2514#issuecomment-56881218
If you have a test that reproduces it in 1000 runs, it's fine. I'd improve
it by seeding a random generator with a fixed seed that you saw produce the
problem. TimSort is deterministic, so it will always throw it in that case
(though this may break if we change the implementation).
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