jackwener commented on PR #4185:
URL: 
https://github.com/apache/arrow-datafusion/pull/4185#issuecomment-1318352325

   agree with you opinion. This problem exists in original code(because some 
code such as `extract join key` from original code).
   Other code also exist this problem, like I find in `projection push down` 
#4174 , This is a big scope problem.
   
   I also am caring some job about `Alias`. such as #4232.
   - remove table-ref-alias in projection
   - fix code which don't consider Alias  
   


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