pgr_withPointsCost
 Calculates the shortest path and returns only the aggregate cost of the shortest path(s) found, for the combination of points given.
Warning
These are proposed functions for next mayor release.
Availability: 2.2.0
Modify the graph to include points defined by points_sql. Using Dijkstra algorithm, return only the aggregate cost of the shortest path(s) found.
pgr_withPointsCost(edges_sql, points_sql, start_vid, end_vid, directed, driving_side)
pgr_withPointsCost(edges_sql, points_sql, start_vid, end_vids, directed, driving_side)
pgr_withPointsCost(edges_sql, points_sql, start_vids, end_vid, directed, driving_side)
pgr_withPointsCost(edges_sql, points_sql, start_vids, end_vids, directed, driving_side)
RETURNS SET OF (start_vid, end_vid, agg_cost)
Note
There is no details flag, unlike the other members of the withPoints family of functions.
pgr_withPointsCost(edges_sql, points_sql, start_vid, end_vid)
RETURNS SET OF (start_vid, end_vid, agg_cost)
Example: 

SELECT * FROM pgr_withPointsCost(
'SELECT id, source, target, cost, reverse_cost FROM edge_table ORDER BY id',
'SELECT pid, edge_id, fraction, side from pointsOfInterest',
1, 3);
start_pid  end_pid  agg_cost
++
1  3  3.2
(1 row)
pgr_withPointsCost(edges_sql, points_sql, start_vid, end_vid,
directed:=true, driving_side:='b')
RETURNS SET OF (seq, node, edge, cost, agg_cost)
Example: 

SELECT * FROM pgr_withPointsCost(
'SELECT id, source, target, cost, reverse_cost FROM edge_table ORDER BY id',
'SELECT pid, edge_id, fraction, side from pointsOfInterest',
1, 3,
directed := false);
start_pid  end_pid  agg_cost
++
1  3  1.6
(1 row)
pgr_withPointsCost(edges_sql, points_sql, start_vid, end_vids,
directed:=true, driving_side:='b')
RETURNS SET OF (start_vid, end_vid, agg_cost)
Example: 

SELECT * FROM pgr_withPointsCost(
'SELECT id, source, target, cost, reverse_cost FROM edge_table ORDER BY id',
'SELECT pid, edge_id, fraction, side from pointsOfInterest',
1, ARRAY[3,5]);
start_pid  end_pid  agg_cost
++
1  3  3.2
1  5  1.6
(2 rows)
pgr_withPointsCost(edges_sql, points_sql, start_vids, end_vid,
directed:=true, driving_side:='b')
RETURNS SET OF (start_vid, end_vid, agg_cost)
Example: 

SELECT * FROM pgr_withPointsCost(
'SELECT id, source, target, cost, reverse_cost FROM edge_table ORDER BY id',
'SELECT pid, edge_id, fraction, side from pointsOfInterest',
ARRAY[1,2], 3);
start_pid  end_pid  agg_cost
++
1  3  3.2
2  3  2.6
(2 rows)
pgr_withPointsCost(edges_sql, points_sql, start_vids, end_vids,
directed:=true, driving_side:='b')
RETURNS SET OF (start_vid, end_vid, agg_cost)
Example: 

SELECT * FROM pgr_withPointsCost(
'SELECT id, source, target, cost, reverse_cost FROM edge_table ORDER BY id',
'SELECT pid, edge_id, fraction, side from pointsOfInterest',
ARRAY[1,2], ARRAY[3,7]);
start_pid  end_pid  agg_cost
++
1  3  3.2
1  7  3.6
2  3  2.6
2  7  3
(4 rows)
edges_sql:  an SQL query, which should return a set of rows with the following columns: 

Column  Type  Default  Description 

id  ANYINTEGER 
Identifier of the edge.  
source  ANYINTEGER 
Identifier of the first end point vertex of the edge.  
target  ANYINTEGER 
Identifier of the second end point vertex of the edge.  
cost  ANYNUMERICAL 
Weight of the edge (source, target)


reverse_cost  ANYNUMERICAL 
1  Weight of the edge (target, source),

Where:
ANYINTEGER:  SMALLINT, INTEGER, BIGINT 

ANYNUMERICAL:  SMALLINT, INTEGER, BIGINT, REAL, FLOAT 
points_sql:  an SQL query, which should return a set of rows with the following columns: 

Column  Type  Description 

pid  ANYINTEGER 
(optional) Identifier of the point.

edge_id  ANYINTEGER 
Identifier of the “closest” edge to the point. 
fraction  ANYNUMERICAL 
Value in <0,1> that indicates the relative postition from the first end point of the edge. 
side  CHAR 
(optional) Value in [‘b’, ‘r’, ‘l’, NULL] indicating if the point is:

Where:
ANYINTEGER:  smallint, int, bigint 

ANYNUMERICAL:  smallint, int, bigint, real, float 
Parameter  Type  Description 

edges_sql  TEXT 
Edges SQL query as described above. 
points_sql  TEXT 
Points SQL query as described above. 
start_vid  ANYINTEGER 
Starting vertex identifier. When negative: is a point’s pid. 
end_vid  ANYINTEGER 
Ending vertex identifier. When negative: is a point’s pid. 
start_vids  ARRAY[ANYINTEGER] 
Array of identifiers of starting vertices. When negative: is a point’s pid. 
end_vids  ARRAY[ANYINTEGER] 
Array of identifiers of ending vertices. When negative: is a point’s pid. 
directed  BOOLEAN 
(optional). When false the graph is considered as Undirected. Default is true which considers the graph as Directed. 
driving_side  CHAR 

Returns set of (start_vid, end_vid, agg_cost)
Column  Type  Description 

start_vid  BIGINT 
Identifier of the starting vertex. When negative: is a point’s pid. 
end_vid  BIGINT 
Identifier of the ending point. When negative: is a point’s pid. 
agg_cost  FLOAT 
Aggregate cost from start_vid to end_vid . 
Example:  With right side driving topology. 

SELECT * FROM pgr_withPointsCost(
'SELECT id, source, target, cost, reverse_cost FROM edge_table ORDER BY id',
'SELECT pid, edge_id, fraction, side from pointsOfInterest',
ARRAY[1,2], ARRAY[3,7],
driving_side := 'l');
start_pid  end_pid  agg_cost
++
1  3  3.2
1  7  3.6
2  3  2.6
2  7  3
(4 rows)
Example:  With left side driving topology. 

SELECT * FROM pgr_withPointsCost(
'SELECT id, source, target, cost, reverse_cost FROM edge_table ORDER BY id',
'SELECT pid, edge_id, fraction, side from pointsOfInterest',
ARRAY[1,2], ARRAY[3,7],
driving_side := 'r');
start_pid  end_pid  agg_cost
++
1  3  4
1  7  4.4
2  3  2.6
2  7  3
(4 rows)
Example:  Does not matter driving side. 

SELECT * FROM pgr_withPointsCost(
'SELECT id, source, target, cost, reverse_cost FROM edge_table ORDER BY id',
'SELECT pid, edge_id, fraction, side from pointsOfInterest',
ARRAY[1,2], ARRAY[3,7],
driving_side := 'b');
start_pid  end_pid  agg_cost
++
1  3  3.2
1  7  3.6
2  3  2.6
2  7  3
(4 rows)
The queries use the Sample Data network.
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