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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/03/03 01:15:20 UTC

[GitHub] [arrow] westonpace edited a comment on pull request #12460: ARROW-13530: [C++] Implement cumulative sum compute function

westonpace edited a comment on pull request #12460:
URL: https://github.com/apache/arrow/pull/12460#issuecomment-1057562475


   @edponce 
   > @westonpace Why a `ScalarFunction` and not a `VectorFunction`? I understand the ordering issue, but...
   > 
   > An `Array` can be:
   > 
   >     * summed up into a single total sum
   
   This would be a vector function but we already have this with `sum` right?
   
   > 
   >     * cumulative sum resulting in an `Array` with partial sums
   
   Isn't this a scalar function?  I may be misunderstanding the term.  My current interpretation is "each row has a single output value".


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