This pattern works for me:

from sqlalchemy.engine import create_engine
from langchain import SQLDatabase, SQLDatabaseChain
 
engine = create_engine(
  "databricks+connector://token:dapi...@....cloud.databricks.com:443/default",
  connect_args={"http_path": "/sql/1.0/warehouses/...",})
 
db = SQLDatabase(engine, schema="default", include_tables=["nyc_taxi"])