[narendra (Narendra02053)]

Summary

Fixes #9953.

When a caller provides an existing DuckDBPyConnection, the injected connection now takes precedence over connection-related settings.

• Removed the validation that rejected injected connections combined with connection settings.
• Ignore connection_string, config, env_file_path, and env_file_encoding when a client is injected.
• Preserve caller ownership of the injected connection.
• Keep existing settings resolution behavior unchanged when no client is injected.
• Updated constructor documentation and the DuckDB README.
• Added regression tests covering ignored settings and connection ownership.

Validation

• DuckDB tests: 103 passed.
• uv run poe syntax: 86 tasks passed.
• DuckDB Pyright: passed.
• Workspace checks reported unrelated failures in ag-ui and hyperlight.

[Copilot]

🟢 Approval recommended

No active review issues block approval of the injected DuckDB connection precedence change.

No open issues 🎉

What changed in this PR

Fixes #9953 by letting injected DuckDB connections take precedence over connection settings in DuckDBStore and DuckDBCollection, while preserving caller ownership and existing behavior when no client is supplied.

Changes:

• Remove validation that rejected injected clients combined with connection settings.
• Add regression tests for ignored settings, connection ownership, and avoiding new connections.
• Update constructor documentation and the README to explain precedence.

File	Description
python/​packages/​duckdb/​tests/​duckdb/​test_settings.py	Test injected-client precedence and ownership behavior.
python/​packages/​duckdb/​README.md	Document ignored settings when borrowing a connection.
python/​packages/​duckdb/​agent_framework_duckdb/​_vector_store.py	Remove conflicting-settings rejection and update constructor documentation.

_{Review effort: Balanced}

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[narendra (Narendra02053)]

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[narendra (Narendra02053)]

Hi, I checked the failed Merge Gatekeeper run. command_check and team_check were cancelled because another higher-priority request was waiting for the same PR. Could someone help rerun these checks or let me know if anything is needed from my side? My local DuckDB tests are passing (103 passed). Thanks!