alamb opened a new pull request #1401:
URL: https://github.com/apache/arrow-datafusion/pull/1401


   Builds on https://github.com/apache/arrow-datafusion/pull/1376
   
   Re https://github.com/apache/arrow-datafusion/issues/1160 (more 
sophisticated expression simplification)
   
   # Rationale
   
   There is redundant code in `simplify` and `Simplifier` which makes it hard 
to know what is simplified and what is not
   
   # Changes
   1. Combine `simplify` and `Simplifier` code
   2. Remove rules in `Simplifier` that is redundant with `ConstEvaluator`
   


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