Github user sethah commented on the pull request:
https://github.com/apache/spark/pull/9581#issuecomment-176473073
I am thinking about how we can avoid getting `java.lang.ClassCastException`
when passing incorrect `Param` types through to Scala. Is there any reason we
cannot make `expectedType` a required argument? Then we set it if the type
equals expected type, and try to convert it if not. If it cannot be converted
then we raise an exception. It would be nice to avoid users getting somewhat
cryptic, non-intuitive py4j errors. Thoughts?
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