Maarten Breddels created ARROW-9268:

             Summary: [C++] Add is{alnum,alpha,...} kernels for strings
                 Key: ARROW-9268
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Maarten Breddels
            Assignee: Maarten Breddels

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

[] 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. 

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