Github user jkbradley commented on the pull request: https://github.com/apache/spark/pull/2595#issuecomment-58072582 By the way, I realize the timings above are odd (e.g., depth 9 taking less time than depth 5). I'm not sure why this happened. I have not seen that much variance in tests before, and these were all run on the same cluster. I'll try running more tests to verify.
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