xiedeyantu commented on PR #4280:
URL: https://github.com/apache/calcite/pull/4280#issuecomment-2787832056

   > Indeed, isSimpleCondition is pretty close to what you need.
   
   Thanks! The lazy evaluation is ignored. Well, I have two questions that I 
don't understand. The first is that IS NOT DISTINCT FROM will not generate an 
equal join, as modified in CALCITE-6904. The second is that OR is expanded into 
"useful" and "else". It seems that it is not possible to expand only "useful" 
and "else" also needs to participate in the expansion logic. Could you give me 
some modification suggestions based on `isSimpleCondition`?


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