matthewmturner commented on issue #1507:
URL: 
https://github.com/apache/arrow-datafusion/issues/1507#issuecomment-1023379907


   @houqp how would this work in datafusions case though since we dont allow 
relation / table qualifier? Postgres seems to show duplicate columns without a 
qualifier which i dont think we can do.
   
   Also, regarding that being a subquery bug - would you be able to expand on 
that point? I hadnt really thought of this as a subquery.  Are you referring to 
what this turns into at the logical / physical plan level. 


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