alamb commented on PR #25688:
URL: https://github.com/apache/datafusion/pull/25688#issuecomment-6006654220

   > Projection pushdown is one concrete example of where another boundary 
could be useful. The important part is not this specific invariant, but that 
the same mechanism could express it naturally:
   
   I don't fully understand the use of this boundary -- when writing an 
OptimizerRule or trying to understand one, ideally I would not care if the 
projection was an explicit ProjectionExec or embedded in another ExecutionPlan 
unless it was relevant for my optimization


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