RussellSpitzer commented on code in PR #10020:
URL: https://github.com/apache/iceberg/pull/10020#discussion_r1634994844


##########
api/src/main/java/org/apache/iceberg/Schema.java:
##########
@@ -507,4 +539,48 @@ public String toString() {
                 .map(this::identifierFieldToString)
                 .collect(Collectors.toList())));
   }
+
+  /**
+   * Fields identified as 'Metadata Fields' will have their field ID's 
reassigned.
+   *
+   * @return map of original to reassigned field ids
+   */
+  public Map<Integer, Integer> idsToReassigned() {
+    return idsToReassigned != null ? idsToReassigned : Collections.emptyMap();
+  }
+
+  /**
+   * All ids of metadata fields are reassigned.
+   *
+   * @return map of reassigned to original field ids of metadata fields
+   */
+  public Map<Integer, Integer> idsToOriginal() {
+    return idsToOriginal != null ? idsToOriginal : Maps.newHashMap();

Review Comment:
   Same as a above with immutable empty map (sorry I meant to note this on the 
last pass)



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