alamb opened a new issue #1175:
URL: https://github.com/apache/arrow-datafusion/issues/1175


   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   This is a follow on suggestion from @rdettai  on 
https://github.com/apache/arrow-datafusion/pull/1153 
https://github.com/apache/arrow-datafusion/pull/1153/files#r735437280
   
   Namely the substitution of `now()` for the current value is better described 
as "constant evaluation" rather than "algebraic simplification" so it should be 
done in the `ConstEvaluator` code. 
   
   **Describe the solution you'd like**
   Move code to fold `now()` from `Simplifier()` to `ConstEvaluator`
   
   


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