Dandandan commented on pull request #1402:
URL: https://github.com/apache/arrow-datafusion/pull/1402#issuecomment-987615421


   I am not sure we would want to do this?
   
   As a user that might want more control over the execution and join order (to 
save time, memory in a specific query) currently can help DataFusion a bit by 
using the smaller side in a join as the left side, or even disable the 
optimization rule to have full control.
   
   This usage becomes harder when we choose to not respect the SQL syntax and 
instead encode a right join as a left join even if the user carefully picked 
the smaller left side in his query?
   
   


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