kiyeonjeon21 commented on PR #54058:
URL: https://github.com/apache/spark/pull/54058#issuecomment-4638540127

   I might be missing something, but from my reading the code change itself 
makes sense.
   
   I had one question about the added test: `Option(null)` becomes `None` in 
Scala, and there is already a `None` case just above it. So I’m not sure the 
new assertion exercises the same path as the original issue.
   
   Was the original issue from the instance `metrics()` method creating 
`Some(null)`? If so, would it be useful to cover that path directly?


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