haruki-830 commented on code in PR #4540:
URL: https://github.com/apache/flink-cdc/pull/4540#discussion_r4024815090


##########
flink-cdc-runtime/src/main/java/org/apache/flink/cdc/runtime/operators/schema/common/SchemaRegistry.java:
##########
@@ -132,6 +138,28 @@ public void start() throws Exception {
             this.schemaManager = new SchemaManager();
         }
         this.router = new TableIdRouter(routingRules, routeMode);
+        if (existingTableSchemaExpansionEnabled) {
+            try {
+                metadataApplier
+                        .getExistingTableSchemaExpansionSupport()
+                        .ifPresent(

Review Comment:
   Addressed in the latest commit. 
   When schema expansion is explicitly enabled but the MetadataApplier does not 
provide the required support, the framework now logs a warning with the applier 
implementation and continues with the sink’s original handling.



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