Ensure pyarrow.csv is available in tests (if installed)#19052
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A `pyarrow` test fails if it is executed before `pyarrow.csv` is imported, which previously could happen if the tests run in parallel. Now the `pyarrow` tests import `pyarrow.csv` at module level (if `pyarrow` is installed`).
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…052-on-v7.2.x Backport PR #19052 on branch v7.2.x (Ensure `pyarrow.csv` is available in tests (if installed))
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Description
In #19049 the parallel tests CI job failed with
AttributeError: module 'pyarrow' has no attribute 'csv'. This happens if the test in question is executed before anything importspyarrow.csv, which can happen in the parallel tests job where the test execution order is not deterministic. A simple way to prevent this problem is to importpyarrow.csvat the module level.