Github user ueshin commented on the issue:
https://github.com/apache/spark/pull/16007
@rxin The default value is `""` (`UTF8String.fromString("")`) if input file
name is not set for now.
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/rdd/InputFileNameHolder.scala#L32
Should we change the default value to `null`?
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