wesm commented on PR #12460:
URL: https://github.com/apache/arrow/pull/12460#issuecomment-1159285230

   Yes, definitely. I'm just referring to the _implementation_ of e.g. 
`f(scalar) -> scalar)` or `g(scalar, scalar) -> scalar` — the ability to 
perform these operations will remain but the implementation will use the array 
implementation allowing us to simply delete the all-scalar implementation. See 
for example what it looks like to have duplicate implementations of a scalar 
kernel like "map_lookup"
   
   
https://github.com/apache/arrow/blob/master/cpp/src/arrow/compute/kernels/scalar_nested.cc#L614


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