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/* :file: This file is part of the pgRouting project.
:copyright: Copyright (c) 2018-2026 pgRouting developers
:license: Creative Commons Attribution-Share Alike 3.0 https://creativecommons.org/licenses/by-sa/3.0 */
BEGIN;
SELECT plan(10);
UPDATE edges SET cost = sign(cost) + 0.001 * id * id, reverse_cost = sign(reverse_cost) + 0.001 * id * id;
--
PREPARE prim1 AS
SELECT seq, depth, start_vid, node, edge, cost, agg_cost
FROM pgr_primDFS(
'SELECT id, source, target, cost, reverse_cost
FROM edges WHERE id > 18 ORDER BY id',
21, 3
);
SELECT set_eq('prim1',
$$VALUES (1, 0, 21, 21, -1, 0, 0) $$,
'1: Empty Graph -> Only root vertex is returned');
PREPARE prim2 AS
SELECT seq, depth, start_vid, node, edge, cost, agg_cost
FROM pgr_primDFS(
'SELECT id, source, target, cost
FROM edges WHERE id > 18 ORDER BY id',
ARRAY[21, 45],
3
);
SELECT set_eq('prim2',
$$VALUES
(1, 0, 21, 21, -1, 0, 0),
(2, 0, 45, 45, -1, 0, 0)
$$,
'2: Empty graph -> Only root vertices are returned');
--
PREPARE prim3 AS
SELECT seq, depth, start_vid, node, edge, cost, agg_cost
FROM pgr_primDFS(
'SELECT id, source, target, cost, reverse_cost
FROM edges ORDER BY id',
21, 3
);
SELECT set_eq('prim3',
$$VALUES (1, 0, 21, 21, -1, 0, 0) $$,
'3: Root not in Graph -> Only root vertex is returned');
--
PREPARE prim4 AS
SELECT seq, start_vid, depth, edge, agg_cost <= 3.5
FROM pgr_primDFS(
'SELECT id, source, target, cost
FROM edges ORDER BY id',
ARRAY[21, 15],
3
);
SELECT set_eq('prim4',
$$VALUES
(1, 15, 0, -1, true),
(2, 15, 1, 16, true),
(3, 15, 2, 9, true),
(4, 15, 3, 5, true),
(5, 15, 3, 8, true),
(6, 15, 3, 11, true),
(7, 21, 0, -1, true)
$$,
'4: Root not in Graph -> Only root vertex is returned, Root in graph -> spanning tree is returned');
--
PREPARE prim5 AS
SELECT seq, start_vid, depth, edge, depth <= 3
FROM pgr_primDFS(
'SELECT id, source, target, cost, reverse_cost
FROM edges ORDER BY id',
0, 3
);
SELECT set_eq('prim5',
$$VALUES
(1, 5, 0, -1, true),
(2, 5, 1, 1, true),
(3, 5, 2, 2, true),
(4, 5, 3, 3, true),
(5, 5, 3, 5, true),
(6, 5, 2, 4, true),
(7, 5, 3, 7, true),
(8, 5, 3, 10, true),
(9, 2, 0, -1, true),
(10, 2, 1, 17, true),
(11, 13, 0, -1, true),
(12, 13, 1, 18, true)
$$,
'5: root = 0 -> forest (with random root vertices)');
--
PREPARE prim6 AS
SELECT *
FROM pgr_primDFS(
'SELECT id, source, target, cost, reverse_cost
FROM edges ORDER BY id',
4, -3
);
SELECT throws_ok('prim6',
CASE WHEN min_version('3.7.0') THEN 'XX000' ELSE 'P0001' END,
'Negative value found on ''max_depth''',
'6: Negative max_depth throws');
PREPARE prim7 AS
SELECT *
FROM pgr_primDFS(
'SELECT id, source, target, cost, reverse_cost
FROM edges ORDER BY id',
ARRAY[4, 10], -3
);
SELECT throws_ok('prim7',
CASE WHEN min_version('3.7.0') THEN 'XX000' ELSE 'P0001' END,
'Negative value found on ''max_depth''',
'7: Negative max_depth throws');
--
PREPARE prim8 AS
SELECT seq, depth, start_vid, node, edge, cost, agg_cost
FROM pgr_primDFS(
'SELECT id, source, target, cost, reverse_cost
FROM edges ORDER BY id',
15, 0
);
SELECT set_eq('prim8',
$$VALUES (1, 0, 15, 15, -1, 0, 0) $$,
'8: 0 max_depth -> Only root vertex is returned');
--
PREPARE prim9 AS
SELECT seq, depth, edge, depth <= 9223372036854775807
FROM pgr_primDFS(
'SELECT id, source, target, cost, reverse_cost
FROM edges ORDER BY id',
15
);
SELECT set_eq('prim9',
$$VALUES
(1, 0, -1, true),
(2, 1, 3, true),
(3, 2, 2, true),
(4, 3, 1, true),
(5, 3, 4, true),
(6, 4, 7, true),
(7, 5, 6, true),
(8, 4, 10, true),
(9, 5, 14, true),
(10, 2, 5, true),
(11, 3, 9, true),
(12, 3, 11, true),
(13, 4, 13, true)
$$,
'9: default max_depth -> complete tree from root');
--
PREPARE prim10 AS
SELECT seq, start_vid, depth, edge, depth <= 9223372036854775807
FROM pgr_primDFS(
'SELECT id, source, target, cost, reverse_cost
FROM edges ORDER BY id',
0
);
SELECT set_eq('prim10',
$$VALUES
(1, 5, 0,-1, true),
(2, 5, 1, 1, true),
(3, 5, 2, 2, true),
(4, 5, 3, 3, true),
(5, 5, 3, 5, true),
(6, 5, 4, 9, true),
(7, 5, 4,11, true),
(8, 5, 5,13, true),
(9, 5, 2, 4, true),
(10, 5, 3, 7, true),
(11, 5, 4, 6, true),
(12, 5, 3,10, true),
(13, 5, 4,14, true),
(14, 2, 0,-1, true),
(15, 2, 1,17, true),
(16, 13, 0,-1, true),
(17, 13, 1,18, true)
$$,
'10: root = 0 -> forest (with random root vertices)');
SELECT * FROM finish();
ROLLBACK;
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