andygrove opened a new issue, #3781:
URL: https://github.com/apache/arrow-datafusion/issues/3781

   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   
   We currently support uncorrelated scalar subqueries by translating them into 
a cross-join. It would likely be more efficient to execute the subquery and 
update the original plan with the scalar value.
   
   A clear and concise description of what the problem is. Ex. I'm always 
frustrated when [...] 
   
   
   **Describe the solution you'd like**
   
   **Describe alternatives you've considered**
   
   **Additional context**
   


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