“WHERE”处或附近的语法错误

CREATE OR REPLACE FUNCTION shiftwisedata_sp(INOut shiftid bigint,InOut userdate date,OUT shift_name character varying (50),OUT from_time character varying(50),OUT to_time character varying(50),OUT cal bigint)
  RETURNS SETOF record AS
$BODY$
  BEGIN
return query
SELECT userdate, s.shift_name, 
          ('00:00' + (h.hour  * interval '1Hour'):: time) AS from_time,
          ('00:00' + ((h.hour + 1)  * interval '1Hour'):: time) AS to_time,
          COALESCE(r.Readings, 0) AS readings
   FROM   shift_wise s
   CROSS  JOIN (VALUES(0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
                      (10), (11), (12), (13), (14), (15), (16), (17), (18), (19),
                      (20), (21), (22), (23)) AS h(hour)
   LEFT JOIN LATERAL (SELECT SUM(r.param_value) AS Readings
                 FROM   table_1 r
                 WHERE  r.timestamp_col >= CAST(userdate as timestamp without time zone ) + h.hour  * interval '1Hour'
                   AND  r.timestamp_col < CAST(userdate as timestamp without time zone ) + h.hour + 1 * interval '1Hour'
                   ) AS r 
WHERE s.shift_id = shiftid
 AND (s.to_time > s.from_time              AND 
       h.hour >= date_part(HOUR, s.from_time) AND
       h.hour <  date_part(HOUR, s.to_time) 
    OR
      s.to_time < s.from_time AND
         (h.hour >= date_part(HOUR, s.from_time) OR
          h.hour < date_part(HOUR, s.to_time))
       )
      ORDER BY s.to_time;
	
  END;
$BODY$
  LANGUAGE plpgsql VOLATILE