Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/554#issuecomment-41588930
Lambdas in Python that return None will work fine because we use pickling
for all data after that. The only way this problem can happen is if a Java RDD
has null in it. Do you have an example in Python only (with the current
PySpark) where this happens?
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