Fix Python unit tests broken by google-api-core arriving via cloud-sql-python-connector 1.23.0

[shunping]

Summary

cloud-sql-python-connector 1.23.0 was released on 2026-10-15 and is pulled in by the test extra. It adds a new dependency on google-cloud-sql, which requires google-api-core. As a result, google-api-core is now installed in the non-GCP py3xx tox environments, but google-apitools is not.

Some tests treated "google.api_core imports" as meaning "GCP dependencies are installed", or were skipped only because it failed to import. Those tests now run in environments that can't support them. Python Unit Tests on master has been failing on macOS and Windows since this release.

Failure 1: dataframe/io_test.py

• ReadGbqTransformTests.test_bad_schema_public_api_direct_read fails with ValueError: Please install GCP Dependencies.
• ReadGbqTransformTests.test_unsupported_callable: the expected "got a callable instead" error never appears. Instead it raises TypeError: isinstance() arg 2 must be a type, a tuple of types, or a union.
• Cause: the class was previously skipped when google.api_core was missing. Now that we have google.api_core, but we are still missing the apitools-based BigQuery client in the environment.

Failed workflows and examples:

• https://github.com/apache/beam/actions/workflows/beam_PostCommit_Python_Versions.yml (https://github.com/apache/beam/actions/runs/38809003499/job/116677167177)
• https://github.com/apache/beam/actions/workflows/beam_PreCommit_Python_Dataframes.yml (https://github.com/apache/beam/actions/runs/38809003392/job/116677165106)
• https://github.com/apache/beam/actions/workflows/python_tests.yml (https://github.com/apache/beam/actions/runs/38809003222/job/116677165162)

Failure 2: io/requestresponse_it_test.py and transforms/enrichment_handlers/cloudsql_it_test.py

• TestRedisCache.test_rrio_no_coder_exception fails with
  docker.errors.DockerException: Error while fetching server API version: ('Connection aborted.', FileNotFoundError(2, 'No such file or directory')).
• TestExternalSQLServerEnrichment fails with the same reason.
• Cause: the module skips itself on any ImportError, and apache_beam/io/requestresponse.py unconditionally imports google.api_core.exceptions. Before this release, that import failure was the only thing that skipped the module in non-GCP envs. Now the module loads, TestRedisCache runs, and its Redis testcontainer can't start on runners without a Docker daemon, such as GitHub's macOS runners. It also doesn't work on GitHub's windows runners, because windows runners have a Docker daemon but they only run Windows containers.

Failed workflows and examples:

• https://github.com/apache/beam/actions/workflows/python_tests.yml (https://github.com/apache/beam/actions/runs/38835599344/job/116764324330)

[shunping]

cc'ed @Amar3tto

[github-actions]

📋 Review Summary

This PR updates the test skip guard for ReadGbqTransformTests and ReadUsingReadGbqTests from google.api_core.exceptions.GoogleAPICallError to apitools.base.py.exceptions.HttpError. This accurately reflects the actual dependency on google-apitools for the BigQuery client and resolves test failures in non-GCP environments where google-api-core is now transitively installed.

🔍 General Feedback

• The root cause analysis is clear and accurate.
• Aligning the skip condition with io/gcp/bigquery_test.py and removing the redundant TableFieldSchema check is clean and appropriate.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.92%. Comparing base (76f6e6d) to head (991b804).
⚠️ Report is 200 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #40623       +/-   ##
=============================================
+ Coverage     56.16%   79.92%   +23.75%     
=============================================
  Files          1124      488      -636     
  Lines        178336    82550    -95786     
  Branches       1489        0     -1489     
=============================================
- Hits         100170    65978    -34192     
+ Misses        75645    16572    -59073     
+ Partials       2521        0     -2521     

Flag	Coverage Δ
go	?
java	?
python	79.92% <100.00%> (+0.36%)	⬆️

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