alamb commented on PR #8991:
URL: 
https://github.com/apache/arrow-datafusion/pull/8991#issuecomment-1915696558

   > As this PR relaxes the join key constraints for DataFusion Join operators, 
we don't need to add such Projection during translating Spark query plan in 
Comet.
   
   Yeah, but presumably you will have to update the Join operators to take 
Expressions (rather than `Column`s) and evaluate them on the inputs 


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