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/*PGR-GNU*****************************************************************
File: withPointsVia.sql
Generated with Template by:
Copyright (c) 2015 pgRouting developers
Mail: project@pgrouting.org
Function's developer:
Copyright (c) 2022 Celia Virginia Vergara Castillo
Copyright (c) 2015 Celia Virginia Vergara Castillo
------
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
********************************************************************PGR-GNU*/
--v3.4
CREATE FUNCTION pgr_withPointsVia(
TEXT, -- edges SQL
TEXT, -- points SQL
ANYARRAY, -- via vids
directed BOOLEAN DEFAULT true,
-- via parameters
strict BOOLEAN DEFAULT false,
U_turn_on_edge BOOLEAN DEFAULT true,
-- withPoints parameters
driving_side CHAR DEFAULT 'b', -- 'r'/'l'/'b'/NULL
details BOOLEAN DEFAULT false,
OUT seq INTEGER,
OUT path_id INTEGER,
OUT path_seq INTEGER,
OUT start_vid BIGINT,
OUT end_vid BIGINT,
OUT node BIGINT,
OUT edge BIGINT,
OUT cost FLOAT,
OUT agg_cost FLOAT,
OUT route_agg_cost FLOAT)
RETURNS SETOF RECORD AS
$BODY$
SELECT *
FROM _pgr_withPointsVia( _pgr_get_statement($1), _pgr_get_statement($2), $3, $4, $5, $6, $7, $8);
$BODY$
LANGUAGE SQL VOLATILE STRICT
COST 100
ROWS 1000;
COMMENT ON FUNCTION pgr_withPointsVia(TEXT, TEXT, ANYARRAY, BOOLEAN, BOOLEAN, BOOLEAN, CHAR, BOOLEAN)
IS 'pgr_withPointsVia
- PROPOSED
- Parameters:
- Edges SQL with columns: id, source, target, cost [,reverse_cost]
- Points SQL with columns: [pid], edge_id, fraction [,side]
- ARRAY[via vertices identifiers]
- Optional Parameters
- directed := true
- strict := false
- U_turn_on_edge := true
- driving_side := ''b''
- details := ''false''
- Documentation:
- ${PROJECT_DOC_LINK}/pgr_withPointsVia.html
';
--v2.6
CREATE FUNCTION _pgr_withPointsVia(
sql TEXT,
via_edges BIGINT[],
fraction FLOAT[],
directed BOOLEAN DEFAULT TRUE,
OUT seq INTEGER,
OUT path_id INTEGER,
OUT path_seq INTEGER,
OUT start_vid BIGINT,
OUT end_vid BIGINT,
OUT node BIGINT,
OUT edge BIGINT,
OUT cost FLOAT,
OUT agg_cost FLOAT,
OUT route_agg_cost FLOAT)
RETURNS SETOF RECORD AS
$BODY$
DECLARE
has_rcost boolean;
sql_new_vertices text := ' ';
sql_on_vertex text;
v_union text := ' ';
dummyrec record;
rec1 record;
via_vertices int[];
sql_safe text;
new_edges text;
BEGIN
BEGIN
sql_safe = 'SELECT id, source, target, cost, reverse_cost FROM ('|| sql || ') AS __a';
EXECUTE 'select reverse_cost, pg_typeof(reverse_cost)::text as rev_type from ('||sql_safe||' ) AS __b__ limit 1 ' INTO rec1;
has_rcost := true;
EXCEPTION
WHEN OTHERS THEN
has_rcost = false;
END;
IF array_length(via_edges, 1) != array_length(fraction, 1) then
RAISE EXCEPTION 'The length of via_edges is different of length of via_edges';
END IF;
FOR i IN 1 .. array_length(via_edges, 1)
LOOP
IF fraction[i] = 0 THEN
sql_on_vertex := 'SELECT source FROM ('|| sql || ') __a where id = ' || via_edges[i];
EXECUTE sql_on_vertex into dummyrec;
via_vertices[i] = dummyrec.source;
ELSE IF fraction[i] = 1 THEN
sql_on_vertex := 'SELECT target FROM ('|| sql || ') __a where id = ' || via_edges[i];
EXECUTE sql_on_vertex into dummyrec;
via_vertices[i] = dummyrec.target;
ELSE
via_vertices[i] = -i;
IF has_rcost THEN
sql_new_vertices = sql_new_vertices || v_union ||
'(SELECT id, source, ' || -i || ' AS target, cost * ' || fraction[i] || ' AS cost,
reverse_cost * (1 - ' || fraction[i] || ') AS reverse_cost
FROM (SELECT * FROM (' || sql || ') __b' || i || ' WHERE id = ' || via_edges[i] || ') __a' || i ||')
UNION
(SELECT id, ' || -i || ' AS source, target, cost * (1 -' || fraction[i] || ') AS cost,
reverse_cost * ' || fraction[i] || ' AS reverse_cost
FROM (SELECT * FROM (' || sql || ') __b' || i || ' where id = ' || via_edges[i] || ') __a' || i ||')';
v_union = ' UNION ';
ELSE
sql_new_vertices = sql_new_vertices || v_union ||
'(SELECT id, source, ' || -i || ' AS target, cost * ' || fraction[i] || ' AS cost
FROM (SELECT * FROM (' || sql || ') __b' || i || ' WHERE id = ' || via_edges[i] || ') __a' || i ||')
UNION
(SELECT id, ' || -i || ' AS source, target, cost * (1 -' || fraction[i] || ') AS cost
FROM (SELECT * FROM (' || sql || ') __b' || i || ' WHERE id = ' || via_edges[i] || ') __a' || i ||')';
v_union = ' UNION ';
END IF;
END IF;
END IF;
END LOOP;
IF sql_new_vertices = ' ' THEN
new_edges := sql;
ELSE
IF has_rcost THEN
new_edges:= 'WITH
orig AS ( ' || sql || '),
original AS (SELECT id, source, target, cost, reverse_cost FROM orig),
the_union AS ( ' || sql_new_vertices || '),
first_part AS ( SELECT * FROM (SELECT id, target AS source, lead(target) OVER w AS target,
lead(cost) OVER w - cost AS cost,
lead(cost) OVER w - cost AS reverse_cost
FROM the_union WHERE source > 0 AND cost > 0
WINDOW w AS (PARTITION BY id ORDER BY cost ASC) ) as n2
WHERE target IS NOT NULL),
second_part AS ( SELECT * FROM (SELECT id, lead(source) OVER w AS source, source as target,
reverse_cost - lead(reverse_cost) OVER w AS cost,
reverse_cost - lead(reverse_cost) OVER w AS reverse_cost
FROM the_union WHERE target > 0 and reverse_cost > 0
WINDOW w AS (PARTITION BY id ORDER BY reverse_cost ASC) ) as n2
WHERE source IS NOT NULL),
more_union AS ( SELECT * from (
(SELECT * FROM original)
UNION
(SELECT * FROM the_union)
UNION
(SELECT * FROM first_part)
UNION
(SELECT * FROM second_part) ) _union )
SELECT * FROM more_union';
ELSE
new_edges:= 'WITH
orig AS ( ' || sql || '),
original AS (SELECT id, source, target, cost FROM orig),
the_union AS ( ' || sql_new_vertices || '),
first_part AS ( SELECT * FROM (SELECT id, target AS source, lead(target) OVER w AS target,
lead(cost) OVER w - cost AS cost
FROM the_union WHERE source > 0 AND cost > 0
WINDOW w AS (PARTITION BY id ORDER BY cost ASC) ) as n2
WHERE target IS NOT NULL ),
more_union AS ( SELECT * from (
(SELECT * FROM original)
UNION
(SELECT * FROM the_union)
UNION
(SELECT * FROM first_part) ) _union )
SELECT * FROM more_union';
END IF;
END IF;
sql_new_vertices := sql_new_vertices || v_union || ' (' || sql || ')';
RETURN query SELECT *
FROM pgr_dijkstraVia(new_edges, via_vertices, directed, has_rcost);
END
$BODY$
LANGUAGE plpgsql VOLATILE STRICT
COST 100
ROWS 1000;
-- COMMENTS
COMMENT ON FUNCTION _pgr_withPointsVia(TEXT, BIGINT[], FLOAT[], BOOLEAN)
IS 'pgRouting internal function DEPRECATED on v3.4.0';
|
