rdblue commented on a change in pull request #3632:
URL: https://github.com/apache/iceberg/pull/3632#discussion_r777646632



##########
File path: core/src/main/java/org/apache/iceberg/BaseUpdatePartitionSpec.java
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@@ -133,7 +133,9 @@ public BaseUpdatePartitionSpec addField(String name, Term 
term) {
     Pair<Integer, String> validationKey = Pair.of(sourceTransform.first(), 
sourceTransform.second().toString());
 
     PartitionField existing = transformToField.get(validationKey);
-    Preconditions.checkArgument(existing == null,
+    Preconditions.checkArgument(existing == null ||
+        (deletes.contains(existing.fieldId()) &&
+            
!existing.transform().dedupName().equals(sourceTransform.second().dedupName())),

Review comment:
       `dedupName` isn't correct. It is okay to drop a `months` field and 
replace it with a `days` field. But the dedup name for both is `time`. Instead, 
this should check the `toString` of the transform to ensure it isn't an 
identical transform.




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