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- **Description:** A generic document loader adapter for SQLAlchemy on top of LangChain's `SQLDatabaseLoader`. - **Needed by:** https://github.com/crate-workbench/langchain/pull/1 - **Depends on:** GH-16655 - **Addressed to:** @baskaryan, @cbornet, @eyurtsev Hi from CrateDB again, in the same spirit like GH-16243 and GH-16244, this patch breaks out another commit from https://github.com/crate-workbench/langchain/pull/1, in order to reduce the size of this patch before submitting it, and to separate concerns. To accompany the SQLAlchemy adapter implementation, the patch includes integration tests for both SQLite and PostgreSQL. Let me know if corresponding utility resources should be added at different spots. With kind regards, Andreas. ### Software Tests ```console docker compose --file libs/community/tests/integration_tests/document_loaders/docker-compose/postgresql.yml up ``` ```console cd libs/community pip install psycopg2-binary pytest -vvv tests/integration_tests -k sqldatabase ``` ``` 14 passed ```  --------- Co-authored-by: Andreas Motl <andreas.motl@crate.io>
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| 1 | Team | Payroll (millions) | Wins |
|---|---|---|---|
| 2 | Nationals | 81.34 | 98 |
| 3 | Reds | 82.20 | 97 |
| 4 | Yankees | 197.96 | 95 |
| 5 | Giants | 117.62 | 94 |
| 6 | Braves | 83.31 | 94 |
| 7 | Athletics | 55.37 | 94 |
| 8 | Rangers | 120.51 | 93 |
| 9 | Orioles | 81.43 | 93 |
| 10 | Rays | 64.17 | 90 |
| 11 | Angels | 154.49 | 89 |
| 12 | Tigers | 132.30 | 88 |
| 13 | Cardinals | 110.30 | 88 |
| 14 | Dodgers | 95.14 | 86 |
| 15 | White Sox | 96.92 | 85 |
| 16 | Brewers | 97.65 | 83 |
| 17 | Phillies | 174.54 | 81 |
| 18 | Diamondbacks | 74.28 | 81 |
| 19 | Pirates | 63.43 | 79 |
| 20 | Padres | 55.24 | 76 |
| 21 | Mariners | 81.97 | 75 |
| 22 | Mets | 93.35 | 74 |
| 23 | Blue Jays | 75.48 | 73 |
| 24 | Royals | 60.91 | 72 |
| 25 | Marlins | 118.07 | 69 |
| 26 | Red Sox | 173.18 | 69 |
| 27 | Indians | 78.43 | 68 |
| 28 | Twins | 94.08 | 66 |
| 29 | Rockies | 78.06 | 64 |
| 30 | Cubs | 88.19 | 61 |
| 31 | Astros | 60.65 | 55 |