RussellSpitzer commented on code in PR #15006:
URL: https://github.com/apache/iceberg/pull/15006#discussion_r2687558608


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core/src/main/java/org/apache/iceberg/MergingSnapshotProducer.java:
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@@ -87,6 +96,7 @@ abstract class MergingSnapshotProducer<ThisT> extends 
SnapshotProducer<ThisT> {
   private final Map<Integer, DataFileSet> newDataFilesBySpec = 
Maps.newHashMap();
   private Long newDataFilesDataSequenceNumber;
   private final Map<Integer, DeleteFileSet> newDeleteFilesBySpec = 
Maps.newHashMap();
+  private final Map<String, DeleteFileSet> duplicateDVsForDataFile = 
Maps.newHashMap();

Review Comment:
   I guess my thought here, is if we are going to spend the time to clean it up 
we may as well just do String, DeleteFiles map. If we were just going to throw 
an error I would keep newDVRefs as a set.



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