Neuw84 commented on issue #17241:
URL: https://github.com/apache/iceberg/issues/17241#issuecomment-4992627508

   I think that code is just used in `catalog.system.rewrite_table_path 
procedure`, not in the MERGE of the Job. 
   
   So MERGE-time DV rewriting = load the previous bitmap, union it with the new 
deletes, write a fresh Puffin file, and drop the old DV in the same RowDelta 
commit. In Spark this is driven by `SparkPositionDeltaWrite` wrapping 
`BaseDVFileWriter`. That's the streaming/MERGE path.
   
   


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