alamb commented on PR #11456:
URL: https://github.com/apache/datafusion/pull/11456#issuecomment-2294825368

   > I was hoping to merge that first before taking a stab at the required 
extensions in datafusion/sql/src/planner.rs that would allow us to run those 
queries. Once we have those I will be able to add some SLT tests and fix any 
newly uncovered bugs in both files.
   
   Implementing in phases makes sense to me and is consistent with what we have 
done in other places
   
   However, I still think  we should add basic .slt test coverage (even if they 
simply error our with "unsupported subquery") is to document, with code, what 
the expected behavior is if someone runs this kind of query. 
   
   I think a runtime "not yet implemented" error is fine, but going into 
infinite loops or internal errors is probably less good.


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