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(at)gmail(dot)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