rdblue commented on code in PR #12211:
URL: https://github.com/apache/iceberg/pull/12211#discussion_r1948233450


##########
core/src/main/java/org/apache/iceberg/SchemaUpdate.java:
##########
@@ -293,23 +282,15 @@ public UpdateSchema updateColumn(String name, 
Type.PrimitiveType newType) {
 
     // merge with a rename, if present
     int fieldId = field.fieldId();
-    Types.NestedField update = updates.get(fieldId);
-    if (update != null) {
-      updates.put(
-          fieldId,
-          Types.NestedField.of(fieldId, update.isOptional(), update.name(), 
newType, update.doc()));
-    } else {
-      updates.put(
-          fieldId,
-          Types.NestedField.of(fieldId, field.isOptional(), field.name(), 
newType, field.doc()));
-    }
+    Types.NestedField newField = 
Types.NestedField.from(field).ofType(newType).build();

Review Comment:
   Now, updates always use the builder to preserve existing metadata.



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