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|
BEGIN;
BEGIN
SET client_min_messages TO NOTICE;
SET
/* -- one edge graph */
SELECT * FROM pgr_lineGraph(
'SELECT id, source, target, cost FROM edges WHERE id = 1'
);
NOTICE: Only vertices graph
HINT: 0: out_edges_of(5): 1=(5, 6) = 1
1: out_edges_of(6):
seq | source | target | cost | reverse_cost
-----+--------+--------+------+--------------
(0 rows)
/* -- two edge graphs */
SELECT * FROM pgr_lineGraph($$
SELECT -id AS id, target, source, reverse_cost AS cost FROM edges WHERE id = 1
UNION
SELECT id, source, target, cost FROM edges WHERE id = 1
$$
);
seq | source | target | cost | reverse_cost
-----+--------+--------+------+--------------
1 | 1 | -1 | 1 | 1
(1 row)
SELECT * FROM pgr_lineGraph($$
SELECT id, target, source, reverse_cost AS cost FROM edges WHERE id = 1
UNION
SELECT -id AS id, source, target, cost FROM edges WHERE id = 1
$$
);
seq | source | target | cost | reverse_cost
-----+--------+--------+------+--------------
1 | 1 | -1 | 1 | 1
(1 row)
SELECT * FROM pgr_lineGraph(
'SELECT id, source, target, cost, reverse_cost FROM edges WHERE id = 1'
);
seq | source | target | cost | reverse_cost
-----+--------+--------+------+--------------
1 | -1 | 1 | 1 | 1
(1 row)
SELECT * FROM pgr_lineGraph(
'SELECT id, source, target, cost, reverse_cost FROM edges WHERE id = 17'
);
seq | source | target | cost | reverse_cost
-----+--------+--------+------+--------------
1 | -17 | 17 | 1 | 1
(1 row)
ROLLBACK;
ROLLBACK
|
