Github user jkbradley commented on the pull request: https://github.com/apache/spark/pull/12217#issuecomment-207164623 Apparently it was because of zeroValue being used in multiple places without making a copy. Is this worth committing? I feel like a better solution is to add docs + a unit test to RDD.reduce saying that the combine operation can modify and return the first element. If people agree, I'll do that instead.
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