dwsmith1983 commented on PR #25656:
URL: https://github.com/apache/datafusion/pull/25656#issuecomment-5930399595

   @emilk @alamb could you take a look when you have time? It trims two pieces 
of bookkeeping the optimizer does after each rule, worth 3 to 5% on the wide 
planning benchmarks. The one behavior change, for custom rules that create a 
subquery, is under user-facing changes.
   


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