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simplify getNearestRoadFeature function

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The function only ever returns one result of which only the
place_id is used. So simplify it to return a single place_id
only (or NULL if none is found). Rename funciton to avoid
conflicts when updating an existing database.
This commit is contained in:
Sarah Hoffmann
2020-02-26 10:04:17 +01:00
parent c1ef56c870
commit 84ea0753d8
4 changed files with 16 additions and 19 deletions
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23
sql/partition-functions.src.sql
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@@ -214,29 +214,28 @@ END
$$
LANGUAGE plpgsql;
create or replace function getNearestRoadFeature(in_partition INTEGER, point GEOMETRY) RETURNS setof nearfeature AS $$
CREATE OR REPLACE FUNCTION getNearestRoadPlaceId(in_partition INTEGER, point GEOMETRY)
RETURNS BIGINT
AS $$
DECLARE
r nearfeature%rowtype;
search_diameter FLOAT;
r RECORD;
search_diameter FLOAT;
BEGIN
-- start
IF in_partition = -partition- THEN
search_diameter := 0.00005;
WHILE search_diameter < 0.1 LOOP
FOR r IN
SELECT place_id, null, null, null,
ST_Distance(geometry, point) as distance, null as isguess
FROM location_road_-partition-
WHERE ST_DWithin(geometry, point, search_diameter)
ORDER BY distance ASC limit 1
FOR r IN
SELECT place_id FROM location_road_-partition-
WHERE ST_DWithin(geometry, point, search_diameter)
ORDER BY ST_Distance(geometry, point) ASC limit 1
LOOP
RETURN NEXT r;
RETURN;
RETURN r.place_id;
END LOOP;
search_diameter := search_diameter * 2;
END LOOP;
RETURN;
RETURN NULL;
END IF;
-- end