[GitHub] [arrow] westonpace commented on issue #34353: [Python] Add support for string + string add_checked

["westonpace (via GitHub)" <gi...@apache.org>]

westonpace commented on issue #34353:
URL: https://github.com/apache/arrow/issues/34353#issuecomment-1447147451

   I think you can perhaps achieve this with the `binary_join_element_wise` kernel using an empty separator (admittedly, not intuitive):
   
   ```python
   import pyarrow as pa
   import pyarrow.compute as pc
   
   x = pa.array(['one', 'two', 'three'], pa.string())
   y = pa.array(['1', '2', '3'], pa.string())
   
   print(pc.binary_join_element_wise(x, y, '='))
   print(pc.binary_join_element_wise(x, y, ''))
   
   # [
   #   "one=1",
   #   "two=2",
   #   "three=3"
   # ]
   # [
   #   "one1",
   #   "two2",
   #   "three3"
   # ]
   ```
   
   It appears the current implementation is expecting the `add_checked` function to support strings but I think the decision in Arrow was that `add_checked` is an arithmetic operation and string concatenation is a different function entirely.  That shouldn't (to the best of my knowledge) prevent pandas from converting `string + string` to `binary_join_element_wise` however.


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