westonpace commented on PR #12460:
URL: https://github.com/apache/arrow/pull/12460#issuecomment-1159113163

   > In [ARROW-16577](https://issues.apache.org/jira/browse/ARROW-16577) (which 
I'm going to tackle within the next week hopefully), I'm going to remove the 
all-scalar input path from all kernels and up-promote ExecBatch with all 
scalars to be ExecSpan with arrays of length 1 (and unbox the output to be a 
scalar again if it's appropriate).
   
   An ExecBatch with all scalars does not necessarily have a length of 1.


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