[ARROW-14126] [C++] Add locale support for relevant string compute functions

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Won't Do
• Component/s: C++
• Labels: kernel
• External issue URL: https://github.com/apache/arrow/issues/29716
• Assignee: Unassigned
• Reporter: Eduardo Ponce
• Created: 24/Sep/21 19:16
• Updated: 11/Jan/23 08:37
• Resolved: 09/Aug/22 09:14

Description

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

Issue Links

• is a child of: ARROW-555 [C++] String algorithm library for StringArray/BinaryArray
• relates to: ARROW-13853 [R] String to_title, to_lower, to_upper kernels