Select [COLUMN_NAME] AS, self referencing table - postgresql

Question

The following is my function get_reportees performed on the self referencing table emp_tabref1
CREATE OR REPLACE FUNCTION get_reportees4(IN id integer)
RETURNS TABLE(e_id integer, e_name character varying, e_manager integer, e_man_name character varying) AS
$$
BEGIN
RETURN QUERY
WITH RECURSIVE manger_hierarchy(e_id, e_name, m_id, m_name) AS
(
SELECT e.emp_id, e.emp_name, e.mgr_id, e.emp_name AS man_name
FROM emp_tabref1 e WHERE e.emp_id = id
UNION
SELECT rp.emp_id, rp.emp_name, rp.mgr_id, rp.emp_name AS man_name
FROM manger_hierarchy mh INNER JOIN emp_tabref1 rp ON mh.e_id = rp.mgr_id
)
SELECT * from manger_hierarchy;
END;
$$ LANGUAGE plpgsql VOLATILE
Table structure of emp_tabref1:
CREATE TABLE **emp_tabref1**
(
emp_id integer NOT NULL,
emp_name character varying(50) NOT NULL,
mgr_id integer,
CONSTRAINT emp_tabref_pkey PRIMARY KEY (emp_id),
CONSTRAINT emp_tabref_mgr_id_fkey FOREIGN KEY (mgr_id)
REFERENCES emp_tabref (emp_id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION
)
What I want returned is the hierarchy (both above and below) of the id that we are passing which will have the emp_name, emp_id, mgr_id and mgr_name.
But my function is returning like this:
select * from get_reportees4(9)
e_id e_name e_manager e_man_name
1 9 "Emp9" 10 "Emp9"
2 5 "Emp5" 9 "Emp5"
3 6 "Emp6" 9 "Emp6"
where my expected output is
e_id e_name e_manager e_man_name
1 9 "Emp9" 10 "Emp10"
2 5 "Emp5" 9 "Emp9"
3 6 "Emp6" 9 "Emp9"
The function should return the manager name and not the employee name. Please help!

Answer 1

Found a solution! By creating a new join between the temporary manger_hierarchy table and the emp_tabref1 table using mgr_id and emp_id
CREATE OR REPLACE FUNCTION get_reportees4(IN id integer)
RETURNS TABLE(e_id integer, e_name character varying, e_manager integer, e_man_name character varying) AS
$$
BEGIN
RETURN QUERY
WITH RECURSIVE manger_hierarchy(e_id, e_name, m_id, m_name) AS
(
SELECT e.emp_id, e.emp_name, e.mgr_id, e.emp_name AS man_name
FROM emp_tabref1 e WHERE e.emp_id = id
UNION
SELECT rp.emp_id, rp.emp_name, rp.mgr_id, rp.emp_name AS man_name
FROM manger_hierarchy mh INNER JOIN emp_tabref1 rp ON mh.e_id = rp.mgr_id
)
SELECT manger_hierarchy.e_id, manger_hierarchy.e_name, manger_hierarchy.m_id, emp_tabref1.emp_name
FROM manger_hierarchy LEFT JOIN emp_tabref1 ON manger_hierarchy.m_id = emp_tabref1.emp_id;
END;
$$ LANGUAGE plpgsql VOLATILE
SELECT manger_hierarchy.e_id, manger_hierarchy.e_name, manger_hierarchy.m_id, emp_tabref1.emp_name
FROM manger_hierarchy LEFT JOIN emp_tabref1 ON manger_hierarchy.m_id = emp_tabref1.emp_id;