The initial PR only adds support for fixed-width types. We should also support strings, lists, etc.

Reporter: David Li / @lidavidm
Assignee: David Li / @lidavidm

Related issues:

• [C++] C++ array kernels framework and execution buildout (umbrella issue) (is a child of)
• [C++] Regression introduced in PR 10806 (ARROW-13222: [C++] Improve type support for case_when) (is related to)
• [C++] Reconcile type promotion rules between if_else, case_when, coalesce, select (is related to)
• [C++] Support dictionaries directly in case_when kernel (is related to)

PRs and other links:

• GitHub Pull Request #10806

_{Note: This issue was originally created as ARROW-13222. Please see the migration documentation for further details.}