jorisvandenbossche commented on pull request #12105:
URL: https://github.com/apache/arrow/pull/12105#issuecomment-1009760541
So if `"subtract"` for timestamp results in duration type, I think
`subtract(time, time)` should also give duration? (and not interval)
And it seems that for subtracting time values to get an interval, we
actually already have this covered with the `"<interval type>_between"` kernels:
```
In [14]: reg = pc.function_registry()
In [15]: reg.get_function("month_day_nano_interval_between").kernels
Out[15]:
[ScalarKernel<(any[date32[day]], any[date32[day]]) ->
month_day_nano_interval>,
ScalarKernel<(any[date64[ms]], any[date64[ms]]) -> month_day_nano_interval>,
ScalarKernel<(any[time32[s]], any[time32[s]]) -> month_day_nano_interval>,
ScalarKernel<(any[time32[ms]], any[time32[ms]]) -> month_day_nano_interval>,
ScalarKernel<(any[time64[us]], any[time64[us]]) -> month_day_nano_interval>,
ScalarKernel<(any[time64[ns]], any[time64[ns]]) -> month_day_nano_interval>,
ScalarKernel<(any[timestamp(s)], any[timestamp(s)]) ->
month_day_nano_interval>,
ScalarKernel<(any[timestamp(ms)], any[timestamp(ms)]) ->
month_day_nano_interval>,
ScalarKernel<(any[timestamp(us)], any[timestamp(us)]) ->
month_day_nano_interval>,
ScalarKernel<(any[timestamp(ns)], any[timestamp(ns)]) ->
month_day_nano_interval>]
```
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