geruh commented on PR #14867:
URL: https://github.com/apache/iceberg/pull/14867#issuecomment-3677280836

   Thanks for raising this @singhpk234! I like the direction here. As a user 
today, there are two modes either use scan planning or not. Which begs the 
question, when should I use one versus the other? And right now, there is no 
clear insight or story from the user's perspective. 
   
   Now from a catalog's perspective, the modes make sense. For instance, If the 
catalog is using planning to enforce governance, the `required` mode would 
signify intent. But I do have a question on the semantics. In the current 
implementation IIUC, `optional` seems to be similar to required. Rendering the 
combination of `mode=None ` and Catalog support of planning, as optional. So 
I'd say if the intent is truly to express optionality to the client, should 
there be a client side override that wins. Or is the expectation that the 
catalog avoids sending the mode. 


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