rok commented on pull request #9758:
URL: https://github.com/apache/arrow/pull/9758#issuecomment-803489760


   As per comments in Jiras this should introduce the following:
   * `sum` - don't promote type (e.g. `int32` to `int64`) if possible
   * `sum` / `mean` - should have `min_count` and return `NA` if the count of 
non-nulls is lower than `min_count`.
   * `sum` / `mean` - should short circuit when it becomes impossible for 
non-null count to be below `min_count`.
   * `mean` - should have `skipna` and `keepna` options.


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