rdblue commented on code in PR #17010:
URL: https://github.com/apache/iceberg/pull/17010#discussion_r3501083507


##########
api/src/main/java/org/apache/iceberg/types/IndexByName.java:
##########
@@ -76,9 +82,15 @@ public Map<String, Integer> byName() {
    * @return a map from field ID to name
    */
   public Map<Integer, String> byId() {
+    // a builder is used to swap key and value
     ImmutableMap.Builder<Integer, String> builder = ImmutableMap.builder();
     nameToId.forEach((key, value) -> builder.put(value, key));
-    return builder.build();
+
+    if (useShortNames) {
+      shortNameToId.forEach((key, value) -> builder.put(value, key));
+    }
+
+    return builder.buildKeepingLast();

Review Comment:
   Thanks for looking through the failures and finding this!



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