rdblue commented on a change in pull request #2465:
URL: https://github.com/apache/iceberg/pull/2465#discussion_r617119193



##########
File path: core/src/main/java/org/apache/iceberg/SchemaUpdate.java
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@@ -317,6 +320,31 @@ public UpdateSchema unionByNameWith(Schema newSchema) {
     return this;
   }
 
+  @Override
+  public UpdateSchema setIdentifierFields(Set<String> names) {
+    identifierFields = Sets.newHashSet();

Review comment:
       When setting an instance field, we prefix with `this.` so that it is 
clear that we're initializing state with a larger scope than just the method.




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