Github user rxin commented on the issue:
https://github.com/apache/spark/pull/16007
I wouldn't change the default as it might break compatibility. That said, I
don't think it is safe to just set this to non-nullable because it is a very
implicit assumption, and setting it to be nullable is never "wrong". I'd add
some comment explaining why it is nullable (e.g. "It depends on the semantics
of the caller for InputFileNameHolder, and there is no guarantee that it won't
be null")
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