HyukjinKwon opened a new pull request, #48909:
URL: https://github.com/apache/arrow/pull/48909
### Rationale for this change
The `call_traits` utility only supported lambdas and functors, but not
function pointers. This prevented simplifying code like `fut.Then([](T x) {
return Func(x); })` to `fut.Then(Func)`, as described in GH-18652.
### What changes are included in this PR?
- Added function pointer support to `arrow::internal::call_traits` in
`cpp/src/arrow/util/functional.h`
- Applied the simplifications.
### Are these changes tested?
Yes, I ran all existing tests locally.
### Are there any user-facing changes?
No.
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