Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19454
BTW, for the answer to
https://github.com/apache/spark/pull/19454#issuecomment-335138642, I think you
should take a look at, for example, `flatMap` as a reference in `rdd.py` and
related tests, for example, see `cd ./python/pyspark && grep -r "flatMap"
tests.py` and Python [doctest](https://docs.python.org/2/library/doctest.html).
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