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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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37
layers/waterway/merge_waterway.sql
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@@ -1,15 +1,10 @@
DROP TABLE IF EXISTS osm_important_waterway_linestring CASCADE;
DROP TABLE IF EXISTS osm_important_waterway_linestring_gen1 CASCADE;
DROP TABLE IF EXISTS osm_important_waterway_linestring_gen2 CASCADE;
DROP TABLE IF EXISTS osm_important_waterway_linestring_gen3 CASCADE;
-- We merge the waterways by name like the highways
-- This helps to drop not important rivers (since they do not have a name)
-- and also makes it possible to filter out too short rivers
-- etldoc: osm_waterway_linestring -> osm_important_waterway_linestring
CREATE TABLE IF NOT EXISTS osm_important_waterway_linestring AS (
CREATE MATERIALIZED VIEW osm_important_waterway_linestring AS (
SELECT
(ST_Dump(geometry)).geom AS geometry,
name
@@ -22,11 +17,10 @@ CREATE TABLE IF NOT EXISTS osm_important_waterway_linestring AS (
GROUP BY name
) AS waterway_union
);
CREATE INDEX IF NOT EXISTS osm_important_waterway_linestring_geometry_idx ON osm_important_waterway_linestring USING gist(geometry);
-- etldoc: osm_important_waterway_linestring -> osm_important_waterway_linestring_gen1
CREATE TABLE IF NOT EXISTS osm_important_waterway_linestring_gen1 AS (
CREATE MATERIALIZED VIEW osm_important_waterway_linestring_gen1 AS (
SELECT ST_Simplify(geometry, 60) AS geometry, name
FROM osm_important_waterway_linestring
WHERE ST_Length(geometry) > 1000
@@ -34,7 +28,7 @@ CREATE TABLE IF NOT EXISTS osm_important_waterway_linestring_gen1 AS (
CREATE INDEX IF NOT EXISTS osm_important_waterway_linestring_gen1_geometry_idx ON osm_important_waterway_linestring_gen1 USING gist(geometry);
-- etldoc: osm_important_waterway_linestring_gen1 -> osm_important_waterway_linestring_gen2
CREATE TABLE IF NOT EXISTS osm_important_waterway_linestring_gen2 AS (
CREATE MATERIALIZED VIEW osm_important_waterway_linestring_gen2 AS (
SELECT ST_Simplify(geometry, 100) AS geometry, name
FROM osm_important_waterway_linestring_gen1
WHERE ST_Length(geometry) > 4000
@@ -42,9 +36,32 @@ CREATE TABLE IF NOT EXISTS osm_important_waterway_linestring_gen2 AS (
CREATE INDEX IF NOT EXISTS osm_important_waterway_linestring_gen2_geometry_idx ON osm_important_waterway_linestring_gen2 USING gist(geometry);
-- etldoc: osm_important_waterway_linestring_gen2 -> osm_important_waterway_linestring_gen3
CREATE TABLE IF NOT EXISTS osm_important_waterway_linestring_gen3 AS (
CREATE MATERIALIZED VIEW osm_important_waterway_linestring_gen3 AS (
SELECT ST_Simplify(geometry, 200) AS geometry, name
FROM osm_important_waterway_linestring_gen2
WHERE ST_Length(geometry) > 8000
);
CREATE INDEX IF NOT EXISTS osm_important_waterway_linestring_gen3_geometry_idx ON osm_important_waterway_linestring_gen3 USING gist(geometry);
--- Triggers
CREATE OR REPLACE FUNCTION refresh_osm_important_waterway_linestring() RETURNS trigger AS
$BODY$
BEGIN
REFRESH MATERIALIZED VIEW osm_important_waterway_linestring CONCURRENTLY;
REFRESH MATERIALIZED VIEW osm_important_waterway_linestring_gen1 CONCURRENTLY;
REFRESH MATERIALIZED VIEW osm_important_waterway_linestring_gen2 CONCURRENTLY;
REFRESH MATERIALIZED VIEW osm_important_waterway_linestring_gen3 CONCURRENTLY;
RETURN null;
END;
$BODY$
language plpgsql
CREATE TRIGGER trigger_refresh_osm_important_waterway_linestring
AFTER INSERT OR UPDATE OR DELETE ON osm_waterway_linestring
FOR EACH STATEMENT
EXECUTE PROCEDURE refresh_osm_important_waterway_linestring