Github user njhwang commented on the pull request:
https://github.com/apache/spark/pull/7378#issuecomment-121509584
Okay, think that does it; let me know if the tests seem sufficient (or
overkill). Took the liberty of replacing a few calls to `range()` with
`xrange()` per the documentation for `parallelize()`. Confirmed that
`RDD.aggregate()` appears to be the only problematic handling of zero values,
and that this PR fixes the issue.
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