jorisvandenbossche commented on pull request #10486:
URL: https://github.com/apache/arrow/pull/10486#issuecomment-857612059


   One problem with supporting this for the "null" type, is that a sum of an 
empty array (empty to start with or after skipping all the nulls) can be 
defined as 0 (depending on the value of the `min_count` parameter), while for 
"null" type that can of course only be null.


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