Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/3715#discussion_r23966188
--- 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 --
Alright, it sounds good to allow nulls then.
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