Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4923#issuecomment-77495891
It looks like we take the result of `collectAsIterator` and end up passing
it back into Java to save it to the temporary file. Do you think that we
should just skip this layer of indirection and save it to a temporary file in
the JVM then return that file's path back to Python?
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