Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2030#issuecomment-52693339
New results (testing against 82577339dd58b5811eab5d10667775e61e37ff51,
1f1819b20f887b487557c31e54b8bcd95b582dc6, 1.0.2, and this):

Means:

Standard deviations:

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