mingmwang commented on issue #4267:
URL: 
https://github.com/apache/arrow-datafusion/issues/4267#issuecomment-1328884927

   I think it depends on what the global-state is. If the global states are 
predicates or something related to Column/Exprs, then we should remove such 
kind of global states..   But for some optimization rules, it might be better 
to keep a global state so that it is easily to figure out a best plan.


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