The recommended connector library for Snowflake is snowflake-sqlalchemy<=1.2.4. (This version is required until Superset migrates to sqlalchemy>=1.4.0)
The connection string for Snowflake looks like this:
The schema is not necessary in the connection string, as it is defined per table/query. The role and warehouse can be omitted if defaults are defined for the user, i.e.
Make sure the user has privileges to access and use all required databases/schemas/tables/views/warehouses, as the Snowflake SQLAlchemy engine does not test for user/role rights during engine creation by default. However, when pressing the “Test Connection” button in the Create or Edit Database dialog, user/role credentials are validated by passing “validate_default_parameters”: True to the connect() method during engine creation. If the user/role is not authorized to access the database, an error is recorded in the Superset logs.