Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/2589#issuecomment-57549334
If our unit tests are brittle to changes in parallelism we should fix that
instead of masking the problem with changes here.
Also I'm not sure we want to deviate from the behavior in the rest of Spark
here. @rxin I think this code was taken from Shark. Thoughts?
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