[iennae]

…federated query against AlloyDB for PostgreSQL

Problem:
The BigQuery documentation (https://cloud.google.com/bigquery/docs/alloydb-federated-queries) needs a standalone, tested Python code sample demonstrating how to run a federated query against AlloyDB for PostgreSQL (region tag bigquery_federated_query_alloydb).

Solution:

• Add federated_query_alloydb(project_id: str, connection_id: str) -> None in bigquery/federated_queries/bigquery_federated_query_alloydb.py (Query an AlloyDB for PostgreSQL table in real time from BigQuery using EXTERNAL_QUERY.)
• Add unit tests (bigquery/federated_queries/bigquery_federated_query_alloydb_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_alloydb.py:15, tag bigquery_federated_query_alloydb

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[gemini-code-assist]

Code Review

This pull request introduces a new sample for running federated queries from BigQuery to AlloyDB, along with its corresponding unit tests and configuration files. The feedback recommends adjusting the Python versions in the test configuration to target only the oldest and newest supported releases, and removing unnecessary environment markers for unsupported Python versions in the test requirements.

[gemini-code-assist]

Since Python versions below 3.10 are no longer supported, there is no need to specify environment markers or fallback dependency versions for Python versions older than 3.10. Please remove the ; python_version >= "3.10" marker.

pytest==9.0.3

References

1. Do not specify fallback dependency versions or environment markers for Python versions older than 3.10, as Python versions below 3.10 are no longer supported.

[XrossFox]

LGTM