huadongliu commented on pull request #2303:
URL: https://github.com/apache/iceberg/pull/2303#issuecomment-822819955


   Thanks for PR. I was excited to try it out. Before the rewriteDataFiles 
action in my test, the last snapshot has three manifest files after two table 
writes and one row-level deletion. After the rewriteDataFiles action, the 
latest snapshot has four manifest files. The first three basically change 
manifest entries in the previous manifest files from ADDED to DELETED. The last 
manifest file points to newly created partition data files.
   
   Do the DELETED manifest entries need to be kept in the current snapshot 
(i.e. manifest files 1, 2 and 3)? After expireSnapshots, those data files are 
orphaned anyway.


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