DROP FUNCTION without knowing the number/type of parameters?

Question

I keep all my functions in a text file with \'CREATE OR REPLACE FUNCTION somefunction\'. So if I add or change some function I just feed the file to psql.

Answer 1

Here is the query I built on top of @Сухой27 solution that generates sql statements for dropping all the stored functions in a schema:

WITH f AS (SELECT specific_schema || '.' || ROUTINE_NAME AS func_name 
        FROM information_schema.routines
        WHERE routine_type='FUNCTION' AND specific_schema='a3i')
SELECT
    format('DROP FUNCTION %s(%s);',
      p.oid::regproc, pg_get_function_identity_arguments(p.oid))
FROM pg_catalog.pg_proc p
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = p.pronamespace
WHERE
    p.oid::regproc::text IN (SELECT func_name FROM f);