andygrove commented on PR #2602:
URL: 
https://github.com/apache/arrow-datafusion/pull/2602#issuecomment-1136061856

   I'm moving this back to draft for now.
   
   The `SimplifyExpressions` rule needs to access the "query execution start 
time" but the rule is created before the query starts executing so we need some 
way to get this dynamically.
   
   Perhaps we need to provide the optimizer rules with a trait for accessing 
certain system state.


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