Github user njhwang commented on the pull request:
https://github.com/apache/spark/pull/7378#issuecomment-121083525
I'll note that I did consider adding more copies on line 904 as you
mention, as well as within `RDD.fold()`. I don't believe another copy is
needed, as `RDD.fold()` appears to properly guard against mutation (see comment
in `RDD.fold()`). It appeared other places within the `RDD` module were good as
well, but will investigate more closely with the forthcoming regression tests.
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