bvarghese1 commented on PR #25753:
URL: https://github.com/apache/flink/pull/25753#issuecomment-2540303200

   @lincoln-lil I noticed that you made some similar changes (more specifically 
the planner changes) for optimizing the Deduplicate operator. Would you mind 
giving me some suggestions regarding some planner specific changes that needs 
to be done if we want to support retract mode for a specific operator? I looked 
at your PR and I think I would need to also update the NDU files. Any other 
files/classes that I should look into?


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