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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/06/02 19:35:27 UTC

[GitHub] [arrow] bkietz commented on pull request #10364: ARROW-12074: [C++][Compute] Add scalar arithmetic kernels for decimal

bkietz commented on pull request #10364:
URL: https://github.com/apache/arrow/pull/10364#issuecomment-853329894


   `DispatchBest` is aware of the operation; it has access to the function's name. You could write a `CommonDecimal()` function which returns differing scales/precisions for "add"/"subtract", "divide", and "multiply":
   
   ```c++
   if (auto type = CommonNumeric(*values)) {
     ReplaceTypes(type, values);
   } else if (auto type = CommonDecimal(name_, *values)) {
     ReplaceTypes(type, values);
   }
   ```


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