lvyanquan commented on PR #4540:
URL: https://github.com/apache/flink-cdc/pull/4540#issuecomment-5708295606

   Could we add an end-to-end test that exercises the full configuration 
pipeline? The current tests are thorough at the algorithm level 
(ExistingTableSchemaExpanderTest) and partially cover real connector behavior 
(FlussMetadataApplierTest, PaimonMetadataApplierTest), but they all bypass the 
wiring path:
   ```
   YAML option → Composer → SchemaOperatorFactory → SchemaRegistry / 
BatchSchemaOperator → ExistingTableSchemaExpander → MetadataApplier
   ```
   No test currently verifies that the existing-table.schema-expansion.enabled 
flag actually reaches the expander through the regular streaming, distributed 
streaming, and batch execution paths. A regression in any of these wiring hops 
would not be caught.


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