paleolimbot commented on PR #34013:
URL: https://github.com/apache/arrow/pull/34013#issuecomment-1414695012

   I should have done a search for "Declaration" before somewhat approving this 
approach 😬 
   
   I think this *would* close #33960 if we were constructing our plan in a 
non-deprecated way:
   
   
https://github.com/apache/arrow/blob/2ad89525173bbe3e03814eb4310b6e58fad5b989/r/src/compute-exec.cpp#L44-L46
   
   Since I don't see any declarations in our plan-building process, I'm not 
sure we can avoid building an entire exec plan to get the schema.
   
   It does help us with our Substrait schema calculation, though, since 
presumably we could add a substrait-plan-in-schema-out method.
   
   
https://github.com/apache/arrow/blob/2ad89525173bbe3e03814eb4310b6e58fad5b989/r/src/compute-exec.cpp#L530-L532


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