benibus opened a new pull request, #36222:
URL: https://github.com/apache/arrow/pull/36222
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### Rationale for this change
Internal specializations of `std::hash<FieldPath>` have caused
multiple-definition errors with unity builds.
### What changes are included in this PR?
To avoid exposing a global specialization of `std::hash` (which must be
declared in the `std` namespace), this specifies the `FieldPath::Hash` helper
as a template parameter to hashable containers instead.
### Are these changes tested?
Yes (covered by existing tests)
### Are there any user-facing changes?
No
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