shunping opened a new pull request, #40623:
URL: https://github.com/apache/beam/pull/40623
Two tests in `apache_beam/dataframe/io_test.py` started failing in the
non-GCP `py3xx` tox environments:
- `ReadGbqTransformTests.test_bad_schema_public_api_direct_read`:
`ValueError: Please install GCP Dependencies.`
- `ReadGbqTransformTests.test_unsupported_callable`: the expected "got a
callable instead" error never appeared. Instead it raised
`TypeError: isinstance() arg 2 must be a type, a tuple of types, or a
union`.
**Root cause**
- `ReadGbqTransformTests` was skipped only when `google.api_core` could not
be imported. The tests actually need the apitools-based BigQuery client
(`apache_beam.io.gcp.internal.clients.bigquery`).
- `cloud-sql-python-connector` 1.23.0, released 2026-10-15 and pulled in by
the `test` extra, adds a new dependency on `google-cloud-sql`, which needs
`google-api-core`. So `google.api_core` is now installed in the non-GCP envs,
but `google-apitools` is not.
As a result:
- the test class is no longer skipped
- the BigQuery client module imports but is empty, because its `__init__.py`
swallows the `ImportError`. So `bigquery.TableFieldSchema` doesn't exist.
- `bigquery_tools.TableReference` falls back to `None`, so
`parse_table_reference` ends up calling `isinstance(table, None)`.
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