alamb commented on issue #237:
URL: 
https://github.com/apache/arrow-datafusion/issues/237#issuecomment-844329264


   FYI while I was reviewing the code in 
https://github.com/apache/arrow-datafusion/blob/master/datafusion/src/physical_plan/parquet.rs
 in the context of https://github.com/apache/arrow-datafusion/issues/363 I 
noticed there is already a way to do "partial evaluation" for expressions -- 
maybe we could fake the same to evaluate `Exprs` that have no inputs --  pass 
in a 1 row null array as input or something. 
   
   


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