Reply-To: <newsy@lewczuk.com>
From: "Marek Lewczuk" <newsy@lewczuk.com>
To: "Lista dyskusyjna pgsql-general" <pgsql-general@postgresql.org>,
	"Lista dyskusyjna pgsql-sql" <pgsql-sql@postgresql.org>,
	"Lista dyskusyjna pgsql-bugs" <pgsql-bugs@postgresql.org>
Subject: plPGSQL bug in function creation
Date: Mon, 8 Sep 2003 09:32:28 +0100
Organization: LEWCZUK.COM
Message-ID: <004901c375e3$bd31f660$4701a8c0@marek>
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Hello,
I think that there is a bug in plPGSQL - or maybe I don't know something
about this language. Try to create this function


Ok., this is the function created in plPGSQL:

CREATE FUNCTION "public"."test" (text, text) RETURNS text AS'
BEGIN
  IF $1 THEN
    RETURN $1;
  ELSE
    RETURN $2;
  END IF;
END;
'LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;

If you will execute SELECT test('tess', 'erer') -> then "tess" will be
returned. If you will execute: SELECT test(NULL, 'buuu'); -> then it
will return NULL, but it should return "buuu". I tried to figure out why
it is happening so i modifye this function to this:

CREATE FUNCTION "public"."test" (text, text) RETURNS text AS'
BEGIN
  RETURN 'test';
END;
'LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;

And when i execute: SELECT test(NULL, 'buuu'); -> it returns me NULL
value, when it should return "buuu". Well I think that something is
wrong here.

If I will modify this function again to this:

CREATE FUNCTION "public"."test" (varchar, varchar) RETURNS text AS'
BEGIN
  IF $1 THEN
    RETURN $1;
  ELSE
    RETURN $2;
  END IF;
END;
'LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;

Everything is working OK.. So the problem is in TEXT type definition.

I'm using PG 7.3.1 on Win/Cyg