Github user davies commented on the pull request:
https://github.com/apache/spark/pull/4521#issuecomment-74331235
The `int` in Python is inferred as LongType, but is not converted into
`long`, then it's pickled and unpickled as Integer in JVM by Pyrolite. So you
need to convert the `int` to `long` in Python, or convert the Integer to Long
in JVM.
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