[C++] Add scalar string slicing/substring extract kernel

[asfimport]

This should implement slicing scalar string values of strings arrays with Python semantics with start, stop ,step arguments. This may seem similar to lists, or binary array, but the string length semantics enter into this kernel, which does not need to equal the number of bytes, nor the number of codepoints (accents, etc should be skipped).

 

Reporter: Maarten Breddels / @maartenbreddels
Assignee: Maarten Breddels / @maartenbreddels

Related issues:

• [C++] String algorithm library for StringArray/BinaryArray (is a child of)
• [C++] Add string slice replace kernel (is related to)
• [C++] Implement string space trimming kernels: trim, ltrim, and rtrim (requires)
• [R] Filter with regular expressions (is depended upon by)

PRs and other links:

• GitHub Pull Request #9000

_{Note: This issue was originally created as ARROW-10557. Please see the migration documentation for further details.}

[asfimport]

Maarten Breddels / @maartenbreddels:
This would be easier to implement using the tools in utf8.h (e.g. UTF8FindIfReverse) in that PR

[asfimport]

Antoine Pitrou / @pitrou:
Issue resolved by pull request 9000
#9000