imtzer commented on code in PR #12202:
URL: https://github.com/apache/iceberg/pull/12202#discussion_r1950228939


##########
core/src/main/java/org/apache/iceberg/SchemaUpdate.java:
##########
@@ -391,13 +391,14 @@ private Integer findForMove(String name) {
     if (addedId != null) {
       return addedId;
     }
+    Types.NestedField field = findFieldFromUpdateFirst(name);
+    return field != null ? field.fieldId() : null;
+  }
 
-    Types.NestedField field = findField(name);
-    if (field != null) {
-      return field.fieldId();
-    }
-
-    return null;
+  private Types.NestedField findFieldFromUpdateFirst(String name) {
+    List<Types.NestedField> updatedFields =
+        updates.values().stream().filter(f -> 
f.name().equals(name)).collect(Collectors.toList());

Review Comment:
   > nit: The size of `updatedFields` should be 0 or 1, right? How about 
verifying the size with `Preconditions.checkArgument` method?
   
   Thanks for review! 
   I have thought about the size of `updatedFields` before, as you say it 
should be 0 or 1, but if your call `renameColumn` for different column to a 
same name , the size will greater than 1, but validation has been set in 
`applyChanges`, so I don't add a `Preconditions.checkArgument`
   Should I add a `Preconditions.checkArgument`? Add would be better, validate 
violation at method call



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