Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/16537
Sorry, my example was for validating the object passed to `udf` was
callable, not for the use of the UDF. I still think it's a good idea not to
make assumptions about how a user makes a mistake. Error checking should be
proportional to how difficult it is to find what happened, not how likely it is
to happen.
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