Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/1551#issuecomment-50442362
We aren't passing completely arbitrary iterators of Java objects to
writeIteratorToStream; instead, we only handle iterators of strings and byte
arrays. Nulls in data read from Hadoop input formats should already be
converted to None by the Java pickling code. Do you have an example where
PythonRDD receives a null element and it's not due to a bug? I'm worried that
this patch will mask the presence of bugs.
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