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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