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我在下面的 SQL 代码中找不到错误的原因。请帮我！

CREATE OR REPLACE FUNCTION public.get_points(loc text)
  RETURNS SETOF points_nearby AS
$BODY$
    DECLARE
            rec points_nearby;
        points text[];
        j int;
        poi varchar;
        length int;
    BEGIN
        points := string_to_array(loc, ',');
        length := array_length(points, 1);
        j = 1;
        while j <= length 
        LOOP
            poi := trim('SRID=4326;POINT('||points[j]||')');
            FOR rec IN select "gid", "tb_elev" as elevation,
            st_x("geom") as x,
            st_y("geom")as y, 
            st_distance( poi::geometry, "geom" ) as distance 
            from 
                (
                select *
                from
                "tb_elev" 
                where
                st_within("geom" ,st_buffer(poi::geometry, 50) )
                ) as a order by distance limit 4  
            LOOP
                RETURN NEXT rec;
            END LOOP;

            j := j + 1;

        END LOOP;           
        RETURN;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100
  ROWS 1000;`



select  get_points('971317 2027702');

这是结果消息：

ERROR:  parse error - invalid geometry
HINT:  "971317" <-- parse error at position 7 within geometry
CONTEXT:  PL/pgSQL function get_points(text) line 15 at FOR over SELECT rows
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