silundong commented on PR #4619:
URL: https://github.com/apache/calcite/pull/4619#issuecomment-3506141507

   Perhaps wrapping the D (`dedupFreeVarsNode`) to make it immutable after 
creation would be better. Did I understand you correctly?
   The current draft implements the general decorrelation approach. For some 
very simple cases, the paper also proposes a simpler decorrelation that would 
yield cleaner plans. It seems that matching some fixed patterns using rules 
would suffice. I think the simple decorrelation approach can be considered 
later. 


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