BEGIN;
CREATE EXTENSION IF NOT EXISTS anon CASCADE;
NOTICE:  installing required extension "pgcrypto"
SELECT anon.get_function_schema(NULL::TEXT) IS NULL;
 ?column? 
----------
 t
(1 row)

SELECT anon.get_function_schema('a()') = '';
 ?column? 
----------
 t
(1 row)

SELECT anon.get_function_schema('a(1,2,3)') = '';
 ?column? 
----------
 t
(1 row)

SELECT anon.get_function_schema('"A"(1,2,3)') = '';
 ?column? 
----------
 t
(1 row)

SELECT anon.get_function_schema('a.b()') = 'a';
 ?column? 
----------
 t
(1 row)

SELECT anon.get_function_schema('a."b.c"(''c.d'')') = 'a';
 ?column? 
----------
 t
(1 row)

SELECT anon.get_function_schema('"A.B".c()') = 'A.B';
 ?column? 
----------
 t
(1 row)

SELECT anon.get_function_schema('"A.B"."c.d"()') = 'A.B';
 ?column? 
----------
 t
(1 row)

SELECT anon.get_function_schema('"a("(1,2,3)') = '';
 ?column? 
----------
 t
(1 row)

SELECT anon.get_function_schema('"(a)"."B(1)"(1,2,3)') = '(a)';
 ?column? 
----------
 t
(1 row)

SELECT anon.get_function_schema('"..".".."($$..$$)') = '..';
 ?column? 
----------
 t
(1 row)

SELECT anon.get_function_schema('".......".a()') = '.......';
 ?column? 
----------
 t
(1 row)

SELECT anon.get_function_schema('a."......."()') = 'a';
 ?column? 
----------
 t
(1 row)

SAVEPOINT function_call_error_1;
SELECT anon.get_function_schema('a');
ERROR:  'a' is not a valid function call
ROLLBACK TO function_call_error_1;
ROLLBACK;