Cursor.description returning () instead of None

[fdcastel]

As discussed here.

Working on a new SQLAlchemy dialect I found that firebird-driver does return an empty tuple () instead of None in cursor.description when the cursor has no rows.

• Is this the correct value in this case? What DBAPI says about?
• Should it be changed to None? (as every other database driver used by SQLALchemy does); or
• Should we change SQLAlchemy code to handle both None or ()?

[fdcastel]

According to PEP 249 – Python Database API Specification v2.0 it should really return None.