Github user kanzhang commented on the pull request:
https://github.com/apache/spark/pull/554#issuecomment-42604738
> I considered the idea of using negative length (-4) to pass "None" to
python (PythonRDD.SpecialLengths -1 to -3 are taken). The tricky part however
is that the read() method returns an array of bytes based on the length.
Existing code treats empty array as end of data/stream. So I am not sure how we
would communicate "None" to python. Thoughts ?
@kalpit pls take a look at #644, where I propose to use ```null``` to
signal end of stream instead of an empty array.
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