Github user holdenk commented on the issue:
https://github.com/apache/spark/pull/16537
So I'm curious what the motivation is for adding these checks - looking in
the mailing list archives this doesn't seem like a common error (and the only
stack overflow post about this I saw was using UDFs inside of a parallelize so
I don't think this would have helped). If this is an error people have run into
and found confusing though, the change looks pretty reasonable I'm just a bit
hesitant to add start doing a lot of type checking PRs for things people aren't
running into/having difficulties with.
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