BUG #5776: Unable to create view with parameter in PL/pgsql

The following bug has been logged online:

Bug reference:      5776
Logged by:          Andrey Galkin
Email address:      andvgal@gmail.com
PostgreSQL version: 9.0.1
Operating system:   Debian unstable
Description:        Unable to create view with parameter in PL/pgsql
Details:

Below is simple test case. Perhaps, I'm doing something wrong.

--
============================================================================

START TRANSACTION;

CREATE TABLE t1 (
    some_field INT
);


--
-- WORKS
--
CREATE FUNCTION Bug_create_tmp_view_test()
    RETURNS VOID
AS $$
BEGIN
    CREATE TEMPORARY VIEW v1 AS
        SELECT * FROM t1 WHERE some_field = 1;
END;
$$
LANGUAGE plpgsql;

--
-- FAILS: ERROR:  column "v_some_field" does not exist
--
CREATE FUNCTION Bug_create_tmp_view_test( v_some_field INT4 )
    RETURNS VOID
AS $$
BEGIN
    CREATE TEMPORARY VIEW v2 AS
        SELECT * FROM t1 WHERE some_field = v_some_field;
END;
$$
LANGUAGE plpgsql;

--
-- WORKS
--
CREATE FUNCTION Bug_create_tmp_view_exec_test()
    RETURNS VOID
AS $$
BEGIN
    EXECUTE 'CREATE VIEW v3 AS SELECT * FROM t1 WHERE some_field = 1';
END;
$$
LANGUAGE plpgsql;


--
-- FAILS
--
CREATE FUNCTION Bug_create_tmp_view_exec_test( v_some_field INT4 )
    RETURNS VOID
AS $$
BEGIN
    EXECUTE 'INSERT INTO t1 (some_field) VALUES ( $1 )' USING v_some_field;
    EXECUTE 'CREATE VIEW v4 AS SELECT * FROM t1 WHERE some_field = $1' USING
v_some_field;
END;
$$
LANGUAGE plpgsql;


--

-- Comment the line below to trigger the second form of the/related bug
SELECT Bug_create_tmp_view_test(), Bug_create_tmp_view_test( 1 );
SELECT Bug_create_tmp_view_exec_test(), Bug_create_tmp_view_exec_test( 1 );

ROLLBACK;
--
============================================================================

$ psql -q < pgbug_create_statement.sql


ERROR:  column "v_some_field" does not exist



LINE 2:   SELECT * FROM t1 WHERE some_field = v_some_field



                                              ^



QUERY:  CREATE TEMPORARY VIEW v2 AS



                SELECT * FROM t1 WHERE some_field = v_some_field



CONTEXT:  PL/pgSQL function "bug_create_tmp_view_test" line 2 at SQL
statement

$ psql -q < pgbug_create_statement.sql


ERROR:  there is no parameter $1



LINE 1: CREATE VIEW v4 AS SELECT * FROM t1 WHERE some_field = $1



                                                              ^



QUERY:  CREATE VIEW v4 AS SELECT * FROM t1 WHERE some_field = $1
CONTEXT:  PL/pgSQL function "bug_create_tmp_view_exec_test" line 3 at
EXECUTE statement