snuyanzin opened a new pull request, #27488:
URL: https://github.com/apache/flink/pull/27488

   
   ## What is the purpose of the change
   
   The issue is that right now validation logic (the one which is not related 
to common syntax) is hard coded in converter.
   From another side converters do not allow to extend them.
   The idea is to move validation to operation. Operations could be custom and 
could contain slightly relaxed validation logic.
   
   ## Brief change log
   
   Materialized table operations
   
   
   ## Verifying this change
   
   Mostly existed tests
   however some new test also added
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): ( no)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: ( no)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? ( no)
     - If yes, how is the feature documented? (not applicable )
   


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