mihaibudiu commented on PR #4619:
URL: https://github.com/apache/calcite/pull/4619#issuecomment-3503803368

   > builder.distinct is used there to ensure it is duplicate free.
   
   builder.distinct ensures that it is distinct, but in general the functions 
that do the rewrite do not know that there is a distinct somewhere deep in the 
tree. My question is whether there should be some information that promises 
that the rel node passed to one of these functions is guaranteed to be 
distinct. Maybe the fact that the functions are private is enough, since all 
callers guarantee this.


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