Github user holdenk commented on the issue:
https://github.com/apache/spark/pull/16535
So I generally agree improved error messages are a good thing - but is this
something which people have run into often? Trying to create a UDF with
something that ins't callable seems like an not a super common error?
If this is something we want to do - the follow up question is would we
want to instead move the check inside of the prepare function so the improved
error message would surface for people which try and do RDD transformations
without calleable objects as well.
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