siddharthteotia commented on issue #5664:
URL: 
https://github.com/apache/incubator-pinot/issues/5664#issuecomment-878819171


   @atris, Subqueries can broadly be divided into two categories
   
   - inner query (and there could be multiple of these) referring to same table 
as outer query
   - inner query (and there could be multiple of these) referring to different 
tables not necessarily same as outer query.
   
   Since the overall query might touch more than 1 table and might require us 
to consider data movement / exchange operators (as in the case of join), we 
think it is better to think about both during design. This is the reason why we 
want to approach them together in the design phase to prevent situation where 
we go ahead and design, implement one of the two features and later on find 
ourselves retro-fitting the other one. 


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