Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/3715#discussion_r23815013
--- 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 --
For Kafka, each record is (K,V), but K could be null if not provided by
producer. We pass the bytes from JVM to Python, do the deserialization in
Python, no pickling needed. So we need some way to tell the key is null or
empty string.
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