Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/3715#discussion_r23814616
--- Diff: core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala
---
@@ -313,6 +313,7 @@ private object SpecialLengths {
val PYTHON_EXCEPTION_THROWN = -2
val TIMING_DATA = -3
val END_OF_STREAM = -4
+ val NULL = -5
--- End diff --
So what was the discussion here? Before, the motivation was that Nones from
Python would be encoded as a pickled version of None. Is it that we now want to
send nulls back, and we are not using the pickle library for Java that would
map them? Then it would be okay.
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