Postgres 11

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CREATE OR REPLACE FUNCTION insertTest(
IN ID1 integer, 
IN Value1 character varying,
IN Value2 character varying,
IN Value3 character varying,
IN Status character varying,
IN Active_Flag integer, 
IN Stuff1 smallint,
IN stuff2 smallint)
RETURNS text
LANGUAGE plpgsql
AS $BODY$
BEGIN
   RETURN 'Found.';
END;
$BODY$;
SELECT castsource::regtype, casttarget::regtype, castcontext
FROM   pg_cast
WHERE  castsource = 'int'::regtype
AND    casttarget = 'int2'::regtype;


castsource
casttarget
castcontext


integer
smallint
a


SELECT * FROM insertTest (
550, 'Test_Value1', 
'Test_Value2', 'Test_Value3', 
'DEL', 55, 1, 1);
ERROR:  function inserttest(integer, unknown, unknown, unknown, unknown, integer, integer, integer) does not exist
LINE 1: SELECT * FROM insertTest (
                      ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.


SELECT * FROM insertTest (
550, 'Test_Value1', 
'Test_Value2', 'Test_Value3', 
'DEL', 55, int2 '1', int2 '1');


inserttest


Found.


SELECT * FROM insertTest (
550, 'Test_Value1', 
'Test_Value2', 'Test_Value3', 
'DEL', 55, '1', '1');


inserttest


Found.