bkietz opened a new pull request, #36334:
URL: https://github.com/apache/arrow/pull/36334
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### Rationale for this change
basic_string_view was never really intended to support types other than
chars; the template which the STL intends for use in this situation is
std::span
### What changes are included in this PR?
Since std::span is added in c++20, a minimal polyfill is added named
util::span.
- doesn't include support for static extents
- some accessors like `front()` are not present in util::span
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