Re: [I] [C++] `duration` add missing kernels [arrow]

["randolf-scholz (via GitHub)" <gi...@apache.org>]

randolf-scholz commented on issue #39233:
URL: https://github.com/apache/arrow/issues/39233#issuecomment-2070756267

   There are 2 more operations supported by `numpy` that are missing in the list above:
   
   1. `multiply(duration, double/float) -> duration`
   2. `divide(duration, double/float) -> duration`
   
   In both cases, `numpy` performs automatic rounding towards the specified time resolution:
   
   ```python
   import numpy as np
   td = np.timedelta64(5, "D")
   print(td * 1.5)  # 7 days
   print(td / 1.5)  # 3 days
   ```
   
   Especially the multiply kernel would be very useful, because it is the inverse operation to the `divide(duration, duration) -> double` kernel, which is needed if one wants to reverse pre-processing transformations.
   
   


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