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[C++] Add locale support for relevant string compute functions #29716

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String compute functions do not make use of locale settings for case changing transformations, string comparisons, and number to string casting. Arrow does provides UTF-8 string kernels to handle localization standardization. It would be good to add locale support for string kernels that are affected by it.

The following are string functions that take a locale option as its second argument:

  • str_to_lower
  • str_to_upper
  • str_to_title

Reporter: Eduardo Ponce / @edponce

Related issues:

Note: This issue was originally created as ARROW-14126. Please see the migration documentation for further details.

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