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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/09/29 22:00:19 UTC

[GitHub] [arrow] edponce edited a comment on pull request #11232: ARROW-13853: [R] String to_title, to_lower, to_upper kernels

edponce edited a comment on pull request #11232:
URL: https://github.com/apache/arrow/pull/11232#issuecomment-930574971


   Interesting...the failed tests are because `stringr` behavior for `str_to_title()` is different from Python's `title()` when string begins with an integer. The C++ implementation follows Python's behavior.
   ```c++
   # R stringr
   > str_to_title("1Foo1")  # "1foo1"
   # Python
   >>> "1Foo1".title()  # "1Foo1"
   ```
   I conclude that this also applies for "is_title()" function because it ignores beginning integers...well...`stringr` does not has an `is_title()` function.
   
   What to do in such a case? cc @jonkeane @nealrichardson 


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