RussellSpitzer commented on code in PR #10020:
URL: https://github.com/apache/iceberg/pull/10020#discussion_r1635000070


##########
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();
+  }
+
+  private List<NestedField> reassignMetadataFieldIds(
+      List<NestedField> columns, Set<Integer> metadataFieldIds) {
+    Set<Integer> usedIds =
+        Sets.difference(TypeUtil.indexById(StructType.of(columns)).keySet(), 
metadataFieldIds)
+            .immutableCopy();
+    AtomicInteger nextId = new AtomicInteger();
+
+    Type res =
+        TypeUtil.assignIds(

Review Comment:
   I think this may have some ordering issues ... I'm not sure if this is 
possible but say I see
   
   transformId = 1000
   Then after that I see
   columnId = 1000
   
   Won't I still have a problem? 



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