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Where possible use SQL functions over plpsql

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Paul Norman 2016-09-10 23:50:08 -07:00 zatwierdzone przez GitHub
rodzic 2e6cf4fa03
commit 297d9115bd
1 zmienionych plików z 37 dodań i 37 usunięć
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74
src/import-sql/functions.sql
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@ -1,26 +1,30 @@
CREATE OR REPLACE FUNCTION overlapping_tiles(
geom geometry,
max_zoom_level INTEGER,
buffer_size INTEGER
CREATE OR REPLACE FUNCTION overlapping_tiles (
geom geometry,
max_zoom_level INTEGER,
buffer_size INTEGER
) RETURNS TABLE (
tile_z INTEGER,
tile_x INTEGER,
tile_y INTEGER
tile_z INTEGER,
tile_x INTEGER,
tile_y INTEGER
) AS $$
BEGIN
RETURN QUERY
WITH RECURSIVE tiles(x, y, z, e) AS (
SELECT 0, 0, 0, geom && XYZ_Extent(0, 0, 0, buffer_size)
UNION ALL
SELECT x*2 + xx, y*2 + yy, z+1,
geom && XYZ_Extent(x*2 + xx, y*2 + yy, z+1, buffer_size)
FROM tiles,
(VALUES (0, 0), (0, 1), (1, 1), (1, 0)) as c(xx, yy)
WHERE e AND z < max_zoom_level
)
SELECT z, x, y FROM tiles WHERE e;
END;
$$ LANGUAGE plpgsql IMMUTABLE;
WITH RECURSIVE tiles(x, y, z, e) AS (
SELECT
0,
0,
0,
geom && XYZ_Extent(0, 0, 0, buffer_size)
UNION ALL
SELECT
x*2 + xx,
y*2 + yy,
z+1,
geom && XYZ_Extent(x*2 + xx, y*2 + yy, z+1, buffer_size)
FROM tiles,
(VALUES (0, 0), (0, 1), (1, 1), (1, 0)) as c(xx, yy)
WHERE e AND z < max_zoom_level
)
SELECT z, x, y FROM tiles WHERE e;
$$ LANGUAGE SQL IMMUTABLE;
CREATE OR REPLACE FUNCTION changed_tiles_latest_timestamp()
RETURNS TABLE (x INTEGER, y INTEGER, z INTEGER) AS $$
@ -55,24 +59,20 @@ $$ LANGUAGE plpgsql;
-- specification : https://www.mapbox.com/vector-tiles/mapbox-streets-v7/
-- osm_ids : imposm3 with use_single_id_space:true
CREATE OR REPLACE FUNCTION osm_ids2mbid (osm_ids BIGINT, is_polygon bool ) RETURNS BIGINT AS $$
BEGIN
RETURN CASE
WHEN (osm_ids >= 0 ) THEN ( osm_ids * 10) -- +0 point
WHEN (NOT is_polygon) AND (osm_ids >= -1e17 ) AND (osm_ids < 0 ) THEN ( (abs(osm_ids) ) * 10) + 1 -- +1 way linestring
WHEN ( is_polygon) AND (osm_ids >= -1e17 ) AND (osm_ids < 0 ) THEN ( (abs(osm_ids) ) * 10) + 2 -- +2 way poly
WHEN (NOT is_polygon) AND (osm_ids < -1e17 ) THEN ( (abs(osm_ids) -1e17) * 10) + 3 -- +3 relations linestring
WHEN ( is_polygon) AND (osm_ids < -1e17 ) THEN ( (abs(osm_ids) -1e17) * 10) + 4 -- +4 relations poly
ELSE 0
END;
END;
$$ LANGUAGE plpgsql IMMUTABLE;
SELECT CASE
WHEN (osm_ids >= 0::BIGINT ) THEN ( ( osm_ids ) * 10) -- +0 point
WHEN (NOT is_polygon) AND (osm_ids >= -1e17::BIGINT ) AND (osm_ids < 0 ) THEN ( (abs(osm_ids) ) * 10) + 1 -- +1 way linestring
WHEN ( is_polygon) AND (osm_ids >= -1e17::BIGINT ) AND (osm_ids < 0 ) THEN ( (abs(osm_ids) ) * 10) + 2 -- +2 way poly
WHEN (NOT is_polygon) AND (osm_ids < -1e17::BIGINT ) THEN ( (abs(osm_ids) - 1e17::bigint) * 10) + 3 -- +3 relations linestring
WHEN ( is_polygon) AND (osm_ids < -1e17::BIGINT ) THEN ( (abs(osm_ids) - 1e17::bigint) * 10) + 4 -- +4 relations poly
ELSE 0
END;
$$ LANGUAGE SQL IMMUTABLE;
CREATE OR REPLACE FUNCTION is_polygon( geom geometry) RETURNS bool AS $$
BEGIN
RETURN ST_GeometryType(geom) IN ('ST_Polygon', 'ST_MultiPolygon');
END;
$$ LANGUAGE plpgsql IMMUTABLE;
CREATE OR REPLACE FUNCTION is_polygon(geom geometry) RETURNS bool AS $$
SELECT ST_GeometryType(geom) IN ('ST_Polygon', 'ST_MultiPolygon');
$$ LANGUAGE SQL IMMUTABLE;
/*