Adjust cudf-polars test timeouts

[TomAugspurger]

Description

• Higher per-test timeout for test_parallel_scan timeout, which hit the default 45s timeout for some parameter combinations (fixes https://github.com/rapidsai/cudf/actions/runs/26560674690/job/78242678694#step:13:13133, https://github.com/rapidsai/cudf/actions/runs/26560674690/job/78242678488)
• Bump the job timeout from 25m to 35m (fixes https://github.com/rapidsai/cudf/actions/runs/26560674690/job/78242678485#step:13:12354, https://github.com/rapidsai/cudf/actions/runs/26560674690/job/78242678638)

[coderabbitai]

Actionable comments posted: 0

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 1174c77 and c2735d2.

📒 Files selected for processing (2)

• ci/test_wheel_cudf_polars.sh
• python/cudf_polars/tests/streaming/test_scan.py

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📝 Walkthrough

Summary by CodeRabbit

• Tests

  • Added explicit timeout enforcement for parallel scan test execution.

• Chores

  • Increased timeout allowance for Polars wheel test suite, enabling longer per-version test runs to improve test reliability and reduce premature timeouts.

Walkthrough

This PR increases timeout limits for cudf-polars test execution at two levels: the CI script timeout for wheel tests is extended from 25 minutes to 35 minutes, and a specific parallel scan test is decorated with a 90-second individual test timeout.

Changes

Timeout adjustments for cudf-polars test suite

Layer / File(s)	Summary
CI execution timeout adjustment ci/test_wheel_cudf_polars.sh	The timeout for ./ci/run_cudf_polars_pytests.sh invocation increased from 25m to 35m to allow longer per-version test runs.
Test-level timeout enforcement python/cudf_polars/tests/streaming/test_scan.py	test_parallel_scan decorated with pytest.mark.timeout(90) to enforce 90-second runtime limit on that test.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• rapidsai/cudf#22505: Both PRs adjust the ci/test_wheel_cudf_polars.sh ./ci/run_cudf_polars_pytests.sh invocation timeout, directly touching the same script call.
• rapidsai/cudf#22543: Both PRs modify cudf-polars pytest test execution to adjust timeout behavior for the same test suite.

Suggested labels

Python, improvement, non-breaking, cudf-polars

Suggested reviewers

• jameslamb

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Adjust cudf-polars test timeouts' accurately summarizes the main changes: adjusting timeouts for both a specific test and the overall CI job.
Description check	✅ Passed	The description clearly relates to the changeset by explaining why timeout adjustments were made and referencing specific failing CI runs that motivated each change.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[TomAugspurger]

/merge