#884 add functions and view for routing centreline

gis/centreline/sql/create_function_get_centreline_btwn_intersections.sql

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+CREATE OR REPLACE FUNCTION gis_core.get_centreline_btwn_intersections(
+	_node_start integer,
+	_node_end integer,
+	OUT _node_start_out integer,
+	OUT _node_end integer,
+	OUT links text[],
+	OUT geom geometry)
+    RETURNS record
+    LANGUAGE 'sql'
+    COST 100
+    STABLE STRICT PARALLEL UNSAFE
+AS $BODY$
+WITH results as (
+	SELECT * 
+	FROM pgr_dijkstra('SELECT id, source::int, target::int, cost::int 
+					  as cost from gis_core.routing_centreline_directional', _node_start, _node_end)
+)
+
+SELECT _node_start, _node_end, array_agg(centreline_id), ST_union(ST_linemerge(geom)) as geom 
+from results
+inner join gis_core.routing_centreline_directional on edge=id
+
+$BODY$;
+
+ALTER FUNCTION gis_core.get_centreline_btwn_intersections(integer, integer)
+    OWNER TO gis_admins;
+
+COMMENT ON FUNCTION gis_core.get_centreline_btwn_intersections(integer, integer)
+    IS 'Routing function for centreline, takes in start intersection_id and end intersection_id and returns an array of centreline_id, as well as one line geometry between two intersections.';
+
+GRANT EXECUTE ON FUNCTION gis_core.get_centreline_btwn_intersections(integer, integer) TO bdit_humans;
+
+GRANT EXECUTE ON FUNCTION gis_core.get_centreline_btwn_intersections(integer, integer) TO gis_admins;
+

gis/centreline/sql/create_view_routing_centreline_directional.sql

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+CREATE OR REPLACE VIEW gis_core.routing_centreline_directional AS
+
+SELECT 
+    centreline.centreline_id,
+    concat(centreline.centreline_id, 0)::integer AS id,
+    centreline.from_intersection_id AS source,
+    centreline.to_intersection_id AS target,
+    centreline.shape_length AS cost,
+    centreline.geom
+   FROM gis_core.centreline_latest centreline
+
+UNION
+
+SELECT 
+    centreline.centreline_id,
+    concat(centreline.centreline_id, 1)::integer AS id,
+    centreline.to_intersection_id AS source,
+    centreline.from_intersection_id AS target,
+    centreline.shape_length AS cost,
+    st_reverse(centreline.geom) AS geom
+   FROM gis_core.centreline_latest centreline
+  WHERE centreline.oneway_dir_code = 0;
+
+ALTER TABLE gis_core.routing_centreline_directional
+    OWNER TO gis_admins;
+
+COMMENT ON VIEW gis_core.routing_centreline_directional
+    IS 'A view that contains centreline streets for routing, with duplicated rows for two-way streets and flipped geometries when necessary. A new id has been assigned to each centreline to distinguish duplicated lines.';
+
+GRANT SELECT ON TABLE gis_core.routing_centreline_directional TO bdit_humans;
+GRANT ALL ON TABLE gis_core.routing_centreline_directional TO gis_admins;
+
+
+