kashiwanoha_routing=# SELECT * FROM pgr_astar('SELECT gid as id, source, target, cost_s As cost, x1, y1, x2, y2 FROM ways', 100, 159);
 seq | path_seq | node | edge |       cost        |     agg_cost
-----+----------+------+------+-------------------+------------------
   1 |        1 |  100 | 2168 |   8.5892500035812 |                0
   2 |        2 | 1571 | 4424 |  1.10979209576821 |  8.5892500035812
   3 |        3 | 3232 | 9213 | 0.440968020162748 | 9.69904209934941
   4 |        4 | 6708 |  217 |  2.29065882200656 | 10.1400101195122
   5 |        5 |  159 |   -1 |                 0 | 12.4306689415187
(5 行)

_ https://qiita.com/n-yamanaka/items/9f9ee90ef96fd46f74db#gw-uswextreme