jhrotko commented on code in PR #892:
URL: https://github.com/apache/arrow-java/pull/892#discussion_r2479277132


##########
vector/src/main/codegen/templates/ComplexCopier.java:
##########
@@ -115,13 +108,11 @@ private static void writeValue(FieldReader reader, 
FieldWriter writer, Extension
         }
         break;
       case EXTENSIONTYPE:
-        if (extensionTypeWriterFactory == null) {
-          throw new IllegalArgumentException("Must provide 
ExtensionTypeWriterFactory");
-        }
         if (reader.isSet()) {
           Object value = reader.readObject();
           if (value != null) {
-            writer.addExtensionTypeWriterFactory(extensionTypeWriterFactory);
+            ExtensionTypeWriterFactory writerFactory = 
reader.getExtensionTypeWriterFactory();

Review Comment:
   This is the key change: now the responsibility comes from the reader instead 
of passing down the factory.
   



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