alamb commented on issue #1162:
URL: 
https://github.com/apache/arrow-datafusion/issues/1162#issuecomment-958161846


   @matthewmturner  -- I am not sure -- it might be worth looking at  #1066 and 
#441 to see if the rules in that provide any additional inspiration
   
   There are also transformations of stuff like `(2 + (1 + rand()))` which 
could be written to `(2 + 1) + rand()` and then constant folded where it 
wouldn't be folded before.
   
   THough I think the most interesting / useful thing might be  
https://github.com/apache/arrow-datafusion/issues/1160 but that is likely a bit 
more involved


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