yuxiqian commented on PR #4437:
URL: https://github.com/apache/flink-cdc/pull/4437#issuecomment-4931458555

   Thanks Donghwan for the kind review. I believe it's incorrect for the 
PostgreSQL source to emit partial UpdateEvents that leave the before field 
`null`, as it may break many assumptions in runtime operators / sinks.
   
   I wonder if we can emit the `REPLACE` event in UPSERT changelog mode as it 
carries +U only? Thus we don't have to modify sinks to be "null-tolerance".
   


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