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Initial materialized views and triggers

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This commit is contained in:
stirringhalo
2017-01-02 18:31:17 -05:00
parent 4350aa11f9
commit c64170d9be
4 changed files with 90 additions and 28 deletions
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39
layers/transportation_name/merge_highways.sql
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@@ -1,16 +1,11 @@
DROP TABLE IF EXISTS osm_transportation_name_linestring CASCADE;
DROP TABLE IF EXISTS osm_transportation_name_linestring_gen1 CASCADE;
DROP TABLE IF EXISTS osm_transportation_name_linestring_gen2 CASCADE;
DROP TABLE IF EXISTS osm_transportation_name_linestring_gen3 CASCADE;
-- Instead of using relations to find out the road names we
-- stitch together the touching ways with the same name
-- to allow for nice label rendering
-- Because this works well for roads that do not have relations as well
-- etldoc: osm_highway_linestring -> osm_transportation_name_linestring
CREATE TABLE IF NOT EXISTS osm_transportation_name_linestring AS (
CREATE MATERIALIZED VIEW osm_transportation_name_linestring AS (
SELECT
(ST_Dump(geometry)).geom AS geometry,
-- NOTE: The osm_id is no longer the original one which can make it difficult
@@ -35,11 +30,10 @@ CREATE TABLE IF NOT EXISTS osm_transportation_name_linestring AS (
GROUP BY name, highway, ref
) AS highway_union
);
CREATE INDEX IF NOT EXISTS osm_transportation_name_linestring_geometry_idx ON osm_transportation_name_linestring USING gist(geometry);
-- etldoc: osm_transportation_name_linestring -> osm_transportation_name_linestring_gen1
CREATE TABLE IF NOT EXISTS osm_transportation_name_linestring_gen1 AS (
CREATE MATERIALIZED VIEW osm_transportation_name_linestring_gen1 AS (
SELECT ST_Simplify(geometry, 50) AS geometry, osm_id, member_osm_ids, name, ref, highway, z_order
FROM osm_transportation_name_linestring
WHERE highway IN ('motorway','trunk') AND ST_Length(geometry) > 8000
@@ -47,7 +41,7 @@ CREATE TABLE IF NOT EXISTS osm_transportation_name_linestring_gen1 AS (
CREATE INDEX IF NOT EXISTS osm_transportation_name_linestring_gen1_geometry_idx ON osm_transportation_name_linestring_gen1 USING gist(geometry);
-- etldoc: osm_transportation_name_linestring_gen1 -> osm_transportation_name_linestring_gen2
CREATE TABLE IF NOT EXISTS osm_transportation_name_linestring_gen2 AS (
CREATE MATERIALIZED VIEW osm_transportation_name_linestring_gen2 AS (
SELECT ST_Simplify(geometry, 120) AS geometry, osm_id, member_osm_ids, name, ref, highway, z_order
FROM osm_transportation_name_linestring_gen1
WHERE highway IN ('motorway','trunk') AND ST_Length(geometry) > 14000
@@ -55,9 +49,34 @@ CREATE TABLE IF NOT EXISTS osm_transportation_name_linestring_gen2 AS (
CREATE INDEX IF NOT EXISTS osm_transportation_name_linestring_gen2_geometry_idx ON osm_transportation_name_linestring_gen2 USING gist(geometry);
-- etldoc: osm_transportation_name_linestring_gen2 -> osm_transportation_name_linestring_gen3
CREATE TABLE IF NOT EXISTS osm_transportation_name_linestring_gen3 AS (
CREATE MATERIALIZED VIEW osm_transportation_name_linestring_gen3 AS (
SELECT ST_Simplify(geometry, 120) AS geometry, osm_id, member_osm_ids, name, ref, highway, z_order
FROM osm_transportation_name_linestring_gen2
WHERE highway = 'motorway' AND ST_Length(geometry) > 20000
);
CREATE INDEX IF NOT EXISTS osm_transportation_name_linestring_gen3_geometry_idx ON osm_transportation_name_linestring_gen3 USING gist(geometry);
--- Triggers
CREATE OR REPLACE FUNCTION refresh_osm_transportation_name_linestring() RETURNS trigger AS
$BODY$
BEGIN
REFRESH MATERIALIZED VIEW osm_transportation_name_linestring CONCURRENTLY;
REFRESH MATERIALIZED VIEW osm_transportation_name_linestring_gen1 CONCURRENTLY;
REFRESH MATERIALIZED VIEW osm_transportation_name_linestring_gen2 CONCURRENTLY;
REFRESH MATERIALIZED VIEW osm_transportation_name_linestring_gen3 CONCURRENTLY;
RETURN null;
END;
$BODY$
language plpgsql
CREATE TRIGGER trigger_refresh_osm_transportation_name_linestring
AFTER INSERT OR UPDATE OR DELETE ON osm_highway_linestring
FOR EACH STATEMENT
EXECUTE PROCEDURE refresh_osm_transportation_name_linestring