peter-toth commented on PR #13046:
URL: https://github.com/apache/datafusion/pull/13046#issuecomment-2646358282

   @andygrove , I've updated the PR from `main`.
   Please note that the new `EliminateCommonPhysicalSubexprs` rule is not part 
of the default `PhysicalOptimizer` as the rule has no use in standard 
DataFusion. If you would like to use this rule in Comet then you explicitely 
need to add the rule the optimizer.
   Also, this is a simplified version of the logical rule, it handles 
`ProjectExec` nodes only and doesn't normalize expressions during elimination 
(e.g. `ProjectExec [a + 1, 1 + a]` will not be eliminated for now). But if you 
think the rule is useful I'm happy to port all the features of the logical rule.


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