[GitHub] [arrow] wesm commented on pull request #7530: ARROW-8934: [C++] Enable `compute::Subtract` with timestamp inputs to return duration

[GitBox]

wesm commented on pull request #7530:
URL: https://github.com/apache/arrow/pull/7530#issuecomment-648482567


   Example use in Python:
   
   ```
   In [14]: arr = pa.array(pd.date_range('2000-01-01', periods=20))             
                                                                            
   
   In [15]: arr2 = pa.array(pd.date_range('2000-01-10', periods=20))            
                                                                            
   
   In [16]: pc.subtract(arr, arr2)                                              
                                                                            
   Out[16]: 
   <pyarrow.lib.DurationArray object at 0x7fc0005de0a8>
   [
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000,
     -777600000000000
   ]
   ```


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