Github user rxin commented on the issue:
https://github.com/apache/spark/pull/16007
Alright I looked more into this -- I think your approach might be better
actually.
Can you add an require in `InputFileNameHolder.setInputFileName` to verify
the input is not null, and then document in InputFileNameHolder to say the
returned value should never be null, and empty string if it is unknown?
Then we can change the nullable value to true for this expression.
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