lvyanquan commented on PR #4197:
URL: https://github.com/apache/flink-cdc/pull/4197#issuecomment-3688367918

   > I think alter column type can also be supported. Although we don't know 
what the original type is, most types are already supported, we can throw 
exception if the conversion fails. What do you think? @lvyanquan
   
   I agree to support this ability.
   For the data types before the change, perhaps we can obtain them by querying 
the downstream table structure (if necessary).


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