Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/17274
Just a question about this - the root cause of this issue is when called on
the worker SparkContext is actually not initialized, and it is not specific to
these set of SparkFiles API at all.
In such case all sort of things could fail too when trying to use the
SparkR package inside the UDF. Is that a core use case we should address? Or
should we get better at detecting such use case and message appropriately?
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