[kvlonge]

Why

SQL tests requiring managed UDFs fail during Snowflake function discovery when the connection has no current database, despite an explicit target database. Discovery can also search the wrong catalog when the session database differs.

Closes CHI-401.

Changes

• Qualify function metadata with the existing information-schema relation helper.
• Cover explicit catalogs, identifier escaping and the session-catalog fallback.
• Add a real-Snowflake regression for discovery without a current database.

Verification

• Regression tests failed before the fix; 52 focused adapter unit tests pass afterwards.
• Focused lint, formatting, diff and public-repository hygiene checks pass; make check-ci was not run locally.
• Scoped independent review found no correctness issues.
• Real-Snowflake regression is included for credentialed CI; not executed locally.