CatOrLeader opened a new pull request, #4372:
URL: https://github.com/apache/flink-cdc/pull/4372

   The situation I am describing is as follows:
   
   - Source: Postgres Pipeline Connector with schema evolution enabled
   - Sink: Iceberg Pipeline Connector 
   - Schema Evolution Type: Lenient 
   
   When a DropColumnEvent occurs, the lenient transformation changes the event 
type to AlterColumnTypeEvent, making the column nullable. However, in the 
previous code, there were no changes to the nullability. Instead, only the 
column type was changed. 
   
   Now, an additional check is made for column nullability, and the changes are 
correctly propagated.


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