--

CREATE FUNCTION check_constraint_defs(table_ regclass) RETURNS SETOF check_constraint_def

    AS $_$

SELECT constraint_ FROM util.check_constraint WHERE table_ = $1

$_$;

--

CREATE FUNCTION derived_col_def(check_constraint_def check_constraint_def) RETURNS derived_col_def

    AS $$

SELECT (

  check_constraint_def.constraint_::util.col

--

CREATE FUNCTION derived_col_def(col col) RETURNS derived_col_def

    AS $$

SELECT util.check_constraint_def(col)::util.derived_col_def

$$;

--

CREATE FUNCTION derived_col_defs(table_ regclass) RETURNS SETOF derived_col_def

    AS $$

/* **IMPORTANT**: derived columns *must* be returned in table order (which

should = dependency order), so that they are populated in dependency order */