openinx commented on a change in pull request #2556:
URL: https://github.com/apache/iceberg/pull/2556#discussion_r628665313



##########
File path: api/src/main/java/org/apache/iceberg/types/TypeUtil.java
##########
@@ -151,10 +152,8 @@ public static Type assignFreshIds(Type type, NextID 
nextId) {
    * @return a structurally identical schema with new ids assigned by the 
nextId function
    */
   public static Schema assignFreshIds(Schema schema, NextID nextId) {
-    return new Schema(TypeUtil
-        .visit(schema.asStruct(), new AssignFreshIds(nextId))
-        .asNestedType()
-        .fields());
+    Types.StructType struct = TypeUtil.visit(schema.asStruct(), new 
AssignFreshIds(nextId)).asStructType();

Review comment:
       Yeah,   providing a projected identifier field ids looks very strange 
for people.  I think it's okay to remove the identifier fields when projecting.




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