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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/06/10 11:14:36 UTC

[GitHub] [arrow] jorisvandenbossche edited a comment on pull request #10486: ARROW-13016: [C++][Compute] Support Null type in Sum/Mean/MinMax aggregation

jorisvandenbossche edited a comment on pull request #10486:
URL: https://github.com/apache/arrow/pull/10486#issuecomment-858533111


   `Count` is indeed certainly not a problem for "null" type (since it only counting the values, not calculating anything with them). And also for `MinMax` it seems this kernel always returns a null for empty or all-null numeric arrays, so there wouldn't be an inconsistency here by enabling it for null type. 
   
   So it's mainly `Sum` that would give a type inconsistency. `Mean` might give less of a problem, because currently that kernel always returns a double regardless of the (numeric) input type.
   


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