zeroshade opened a new pull request, #38797:
URL: https://github.com/apache/arrow/pull/38797
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### Rationale for this change
Adding RWMutex to protect `loc` in `TimestampType` and fix the race
condition.
### Are these changes tested?
Yes, a unit test is added which is covered by the CI which runs with `-race`.
### Are there any user-facing changes?
Copying `TimestampType` will now be problematic and linters will show it as
an error. In theory this shouldn't be a problem as most uses of TimestampType
should be utilizing pointers to it rather than the value directly.
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