Github user Arttii commented on the pull request:
https://github.com/apache/spark/pull/4723#issuecomment-97362965
I did try it. Also fails. Py4J docs say that dict and set are converted to
HashMap and HasSet by default. This does not seem to be happening, which is
really weird. So I just put in the direct conversion and everything works. I
might try py4j forums or something. This is fairly weird.
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