Use the same select_table_schema and _normalize_table_path as Redshift

[dbeatty10]

History

datafold#22 was an initial attempt at unblocking data-diff --dbt for DuckDB. This is a second attempt.

Enabling 3-part fully-qualified names (FQN)

This 2nd attempt enables all of the following:

• 1-part paths
• 2-part paths
• 3-part paths

The latter is especially important for the following reasons:

1. DuckDB 0.7.0 adds support for attaching multiple databases
2. It appears that prior to DuckDB 0.7.0, supplying a database/catalog in a 3-part path is allowed and handled gracefully

Implementation details

Both DuckDB and Redshift have lots of similarities with PostgreSQL. So for this implementation, I just copied-pasted two methods from redshift to duckdb:

1. select_table_schema
2. _normalize_table_path