[ARROW-9268] [C++] Add is{alnum,alpha,...} kernels for strings

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/25363
• Assignee: Maarten Breddels
• Reporter: Maarten Breddels
• Created: 29/Jun/20 17:20
• Updated: 11/Jan/23 08:05
• Resolved: 12/Jul/20 04:47

Description

A good list of kernels to have would str->bool kernels, similar to:

https://docs.python.org/3/library/stdtypes.html#str.isalnum and friends.

I think all but `isidentifier` make sense to have. The semantics of the Python functions seem quite reasonable to have in Arrow, but maybe others can provide feedback if this is a complete/reasonable list to have or not.

I am not sure if we need more (or less) functions, or if we want more atomic functions, e.g. test for membership in Unicode categories. 

Issue Links

• is a child of: ARROW-555 [C++] String algorithm library for StringArray/BinaryArray
• links to: GitHub Pull Request #7656