[iennae]

…federated query against Cloud Spanner

Problem:
The BigQuery documentation (https://cloud.google.com/bigquery/docs/spanner-federated-queries) needs a standalone, tested Python code sample demonstrating how to run a federated query against Cloud Spanner (region tag bigquery_federated_query_spanner).

Solution:

• Add federated_query_spanner(project_id: str, connection_id: str) -> None in bigquery/federated_queries/bigquery_federated_query_spanner.py (Query a Cloud Spanner database table in real time from BigQuery using EXTERNAL_QUERY.)
• Add unit tests (bigquery/federated_queries/bigquery_federated_query_spanner_test.py) covering both the success path and API error handling (GoogleAPICallError)

Description

Fixes #

Checklist

Testing

• I have tested this change on a live environment and verified it works as intended.

Compliance & Style

• I have followed the Sample Guidelines.
• The README is updated with all relevant information (if applicable).
• If this PR adds a new sample directory: I updated the CODEOWNERS file.

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Post-Approval Actions

• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• bigquery/federated_queries/bigquery_federated_query_spanner.py:15, tag bigquery_federated_query_spanner

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[gemini-code-assist]

Code Review

This pull request introduces a new Python sample and associated unit tests for running federated queries from BigQuery to Cloud Spanner using EXTERNAL_QUERY. The feedback suggests updating the noxfile_config.py to ignore intermediate Python versions (3.11 and 3.12) so that only the oldest (3.10) and newest (3.13) supported versions are tested, aligning with the repository's testing guidelines.

[gemini-code-assist]

According to the repository's testing guidelines, we should only test the oldest and newest supported Python releases in test configurations (such as noxfile_config.py), ignoring intermediate versions. Since the oldest supported version is Python 3.10 (as indicated by requirements-test.txt), we should test 3.10 and 3.13, while ignoring intermediate versions like 3.11 and 3.12.

Suggested change

	"ignored_versions": ["2.7", "3.7", "3.8", "3.9", "3.10", "3.11"],
	"ignored_versions": ["2.7", "3.7", "3.8", "3.9", "3.11", "3.12"],

References

1. Only test the oldest and newest supported Python releases in test configurations (such as noxfile_config.py), ignoring intermediate versions.

[XrossFox]

LGTM