korlov42 commented on pull request #2623:
URL: https://github.com/apache/calcite/pull/2623#issuecomment-1013229352


   @vlsi, I've added a `@Deprecated` on the Project's constructor. This 
highlighted a bunch of missed places (primarily, adapters). So all of them are 
fixed now, I suppose.
   
   With this deprecation users should be aware of changes. But, IMO, despite 
now the project rel returns correlation variables, the semantic is still the 
same. Before this patch it was possible to set correlated scalar subquery as a 
projection expression. The only difference now is there is an easy way to 
extract all variables  required by such a correlated scalar subqueries.  


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