--
-- regproc
--
/* If objects exist, return oids */
-- without schemaname
SELECT regoper('||/');
 regoper 
---------
 ||/
(1 row)

SELECT regproc('now');
 regproc 
---------
 now
(1 row)

SELECT regclass('pg_class');
 regclass 
----------
 pg_class
(1 row)

SELECT regtype('int4');
 regtype 
---------
 integer
(1 row)

SELECT to_regoper('||/');
 to_regoper 
------------
 ||/
(1 row)

SELECT to_regproc('now');
 to_regproc 
------------
 now
(1 row)

SELECT to_regclass('pg_class');
 to_regclass 
-------------
 pg_class
(1 row)

SELECT to_regtype('int4');
 to_regtype 
------------
 integer
(1 row)

-- with schemaname
SELECT regoper('pg_catalog.||/');
 regoper 
---------
 ||/
(1 row)

SELECT regproc('pg_catalog.now');
 regproc 
---------
 now
(1 row)

SELECT regclass('pg_catalog.pg_class');
 regclass 
----------
 pg_class
(1 row)

SELECT regtype('pg_catalog.int4');
 regtype 
---------
 integer
(1 row)

SELECT to_regoper('pg_catalog.||/');
 to_regoper 
------------
 ||/
(1 row)

SELECT to_regproc('pg_catalog.now');
 to_regproc 
------------
 now
(1 row)

SELECT to_regclass('pg_catalog.pg_class');
 to_regclass 
-------------
 pg_class
(1 row)

SELECT to_regtype('pg_catalog.int4');
 to_regtype 
------------
 integer
(1 row)

/* If objects don't exist, raise errors. */
-- without schemaname
SELECT regoper('||//');
ERROR:  operator does not exist: ||//
LINE 3: SELECT regoper('||//');
                       ^
SELECT regproc('know');
ERROR:  function "know" does not exist
LINE 1: SELECT regproc('know');
                       ^
SELECT regclass('pg_classes');
ERROR:  relation "pg_classes" does not exist
LINE 1: SELECT regclass('pg_classes');
                        ^
SELECT regtype('int3');
ERROR:  type "int3" does not exist
LINE 1: SELECT regtype('int3');
                       ^
-- with schemaname
SELECT regoper('ng_catalog.||/');
ERROR:  schema "ng_catalog" does not exist
LINE 1: SELECT regoper('ng_catalog.||/');
                       ^
SELECT regproc('ng_catalog.now');
ERROR:  schema "ng_catalog" does not exist
LINE 1: SELECT regproc('ng_catalog.now');
                       ^
SELECT regclass('ng_catalog.pg_class');
ERROR:  schema "ng_catalog" does not exist
LINE 1: SELECT regclass('ng_catalog.pg_class');
                        ^
SELECT regtype('ng_catalog.int4');
ERROR:  schema "ng_catalog" does not exist
LINE 1: SELECT regtype('ng_catalog.int4');
                       ^
/* If objects don't exist, return NULL with no error. */
-- without schemaname
SELECT to_regoper('||//');
 to_regoper 
------------
 
(1 row)

SELECT to_regproc('know');
 to_regproc 
------------
 
(1 row)

SELECT to_regclass('pg_classes');
 to_regclass 
-------------
 
(1 row)

SELECT to_regtype('int3');
 to_regtype 
------------
 
(1 row)

-- with schemaname
SELECT to_regoper('ng_catalog.||/');
 to_regoper 
------------
 
(1 row)

SELECT to_regproc('ng_catalog.now');
 to_regproc 
------------
 
(1 row)

SELECT to_regclass('ng_catalog.pg_class');
 to_regclass 
-------------
 
(1 row)

SELECT to_regtype('ng_catalog.int4');
 to_regtype 
------------
 
(1 row)