Custom aggregate function: Collapse vertex rows to polyline

odie_63

Isn't it just a matter of CONCAT them together?

WITH vertices (line_id,part_num,vertex_num,x,y,m) AS 
 (SELECT '001',1,1, 0, 5,  0 FROM dual UNION ALL
 SELECT '001',1,2,10,10,11.18 FROM dual UNION ALL
 SELECT '001',1,3,30, 0,33.54 FROM dual UNION ALL
 SELECT '001',2,1,50,10,33.54 FROM dual UNION ALL
 SELECT '001',2,2,60,10,43.54 FROM dual),
 t1 AS           
 (SELECT x coord, line_id, part_num, vertex_num, 1 weight FROM vertices
  UNION ALL      
 SELECT y   , line_id, part_num, vertex_num,2 weight FROM vertices
 UNION ALL      
 SELECT m   , line_id, part_num, vertex_num,3 weight FROM vertices
 )
, t2 as (
 SELECT line_id, part_num
   , sdo_geometry(2002, NULL, NULL
    , sdo_elem_info_array(1,2,1)
    , CAST(collect (coord ORDER BY line_id, part_num, vertex_num,weight) AS sdo_ordinate_array)) line
 FROM t1       
 GROUP BY line_id, part_num
 )
 select line_id
   , sdo_aggr_concat_lines(line) 
 from t2
 group by line_id
 ;