alamb commented on issue #21231:
URL: https://github.com/apache/datafusion/issues/21231#issuecomment-4347666107

   I don't quite follow the options you are proposing @pepijnve 
   
   You could implement internal recursion by passing in the result Vec (e.g. 
`output: &mut Vec<...>`) but I am not sure what is what you mean
   
   I don't think an API that reports "what columns do you need" would handle 
"scoped" access as was originally described above -- as every time the 
recursion entered a new scope you would have to rebind the column definitions 
somehow
   
   However I am not sure I am answering the questions you had in mind


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