westonpace opened a new pull request, #15180:
URL: https://github.com/apache/arrow/pull/15180

   I ran into this problem while trying to work out partition pruning in the 
new scan node.  I feel like this is a somewhat naive approach but it seems to 
work.
   
   I think it would fail if a `DispatchBest` existed where a n-ary kernel 
existed with non-equal types.  For example, if there was a function foo(int8, 
int32) and it had a dispatch best of some kind.


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