feat(bigquery): add anonymous connection method using AnonymousCredentials #1304
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…tials\n\n- Add BigQueryConnectionMethod.ANONYMOUS\n- Create AnonymousCredentials when method is anonymous\n- Add unit test covering anonymous config validation and open behavior\n\nRefs: CONTRIBUTING guidelines; tests pass via hatch unit-tests
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resolves dbt-labs/dbt-bigquery#358
docs dbt-labs/docs.getdbt.com/#
Related PR: #1045
Note: Even though issue dbt-labs/dbt-bigquery#358 has been marked as resolved, it is only partially resolved. PR #1045 added the
api_endpointconfig, but in order to use (at least some) of the bigquery emulators, we need to be able to use Anonymous credentials.Problem
BigQuery users need a way to connect without credentials (e.g., BigQuery emulator or public/read-only endpoints). Today, dbt-bigquery requires an authenticated method, which blocks these scenarios.
Solution
Add a new connection method, ANONYMOUS, to BigQueryConnectionMethod.
When method=anonymous, create google.auth.credentials.AnonymousCredentials.
Add a unit test that validates the anonymous config and connection acquisition.
No changes to default behavior; this is opt-in and limited to the BigQuery adapter.
This in conjunction with #1045, will allow users to setup dbt to connect to an emulator like https://github.com/goccy/bigquery-emulator
Alternatives Considered
Checklist
Note: This introduces a new profile method value: "anonymous"