nevi-me commented on issue #1116:
URL: 
https://github.com/apache/arrow-datafusion/issues/1116#issuecomment-943070958


   Another interesting thing that could be an optimisation, the 
`CAST(mongo_nyc.trip_distance AS Float64)` could be pushed to the source 
altogether, as it now gets evaluated by both the source and datafusion.
   
   This would work very well with SQL sources.


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