houqp commented on pull request #605:
URL: https://github.com/apache/arrow-datafusion/pull/605#issuecomment-867199051


   > is this something we can change (aka update the using join to produce 
columns and then rely on projection pushdown to prune the uneeded ones out?)
   
   That's a good point, the single column output semantic doesn't need to be 
enforced at the join node level. let me give this a try as well :+1:  This 
could simplify our join handling logic. I will also double check to see if this 
would result in nontrivial runtime overhead for us.


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