amogh-jahagirdar opened a new pull request, #9221:
URL: https://github.com/apache/iceberg/pull/9221

   This is a follow up to https://github.com/apache/iceberg/pull/9183. Null 
gets returned from `committedFiles` in 2 cases:
   
   1.)  The snapshot ID list is empty. This snapshot ID is the set of snapshots 
produced as a result of the transaction
   
   2.).The set of committed files could not exactly be determined (e.g. missing 
any snapshot metadata).
   
   In the first case, the logic should perform cleanup in case there were no 
new snapshots (e.g. ExpireSnapshots) which #9183 pointed out and addressed.
   
   In the second case, we do want to signal to callers that it's a unique 
situation and file deletions should not be performed.
   
   What this change does is return an empty set in case 1 and null in case 2 to 
prevent deleting files when we could not determine the full set of committed 
files.


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