zhengruifeng commented on PR #47935:
URL: https://github.com/apache/spark/pull/47935#issuecomment-2345117171

   > I don't understand the use case for this. Can you explain why this is 
needed better?
   
   @nija-at thanks for reviews
   
   one usage case is information redaction, we can redact the sensitive fields 
of known nodes, once a new node was add it contains PII, the PII maybe leaked 
before we update the redaction logic, then we can use this `Unknown` to replace 
any unknown nodes.
   
   


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