chenjunjiedada opened a new issue, #4749:
URL: https://github.com/apache/iceberg/issues/4749

   Now the `DeleteFile` and `DataFile` don't have `sequenceNumber` method to 
get their sequence number directly, so we have to read inherited metadata from 
`Manifest`. It is not convenient, for example, we use two arrays and `Pair` in 
the delete file index.  
   Besides, we may have some actions to deal with deletes in real production, 
such as cleaning up deletes that have no data file with a smaller sequence 
number.  It would benefit many places if we could add a method `sequenceNumber`.


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