All of the following CREATE OR REPLACE VIEW statements return this error:

ERROR: unknown function: one(): function undefined
SQLSTATE: 42883

Tests:

CREATE OR REPLACE FUNCTION one() RETURNS INT VOLATILE LANGUAGE SQL AS 'SELECT 1';
SELECT * from one();
CREATE OR REPLACE VIEW select_from_udf AS SELECT * from one();
CREATE OR REPLACE VIEW select_from_udf AS SELECT one();
CREATE OR REPLACE VIEW select_from_udf AS SELECT 1 WHERE 1 = one();

These are supported by Postgres. If we won't support these now, an "unimplemented" error should be returned indicating UDFs in views aren't supported instead of reporting the function doesn't exist.

Jira issue: CRDB-25647