a0847b85f1
After each diff import the table `osm_poi_point` is fully rewritten due to a full update of the field tags. It is now good to do an a update, event if the content does not change, postgres delete and reinsert internally the record. Resulting in more write and internal table size raising. Note: not directly linked, but there is a problem in this case, the autocaccum is not sufficient to keep this table size moderate, but grow indefinitely.
115 lines
2.9 KiB
PL/PgSQL
115 lines
2.9 KiB
PL/PgSQL
DROP TRIGGER IF EXISTS trigger_flag ON osm_poi_point;
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DROP TRIGGER IF EXISTS trigger_refresh ON poi_point.updates;
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-- etldoc: osm_poi_point -> osm_poi_point
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CREATE OR REPLACE FUNCTION update_osm_poi_point() RETURNS void AS
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$$
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BEGIN
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UPDATE osm_poi_point
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SET subclass = 'subway'
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WHERE station = 'subway'
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AND subclass = 'station';
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UPDATE osm_poi_point
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SET subclass = 'halt'
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WHERE funicular = 'yes'
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AND subclass = 'station';
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UPDATE osm_poi_point
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SET tags = update_tags(tags, geometry)
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WHERE COALESCE(tags->'name:latin', tags->'name:nonlatin', tags->'name_int') IS NULL
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AND tags != update_tags(tags, geometry);
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END;
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$$ LANGUAGE plpgsql;
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SELECT update_osm_poi_point();
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CREATE OR REPLACE FUNCTION update_osm_poi_point_agg() RETURNS void AS
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$$
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BEGIN
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UPDATE osm_poi_point p
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SET
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agg_stop = CASE
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WHEN p.subclass IN ('bus_stop', 'bus_station', 'tram_stop', 'subway')
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THEN 1
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END
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WHERE
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agg_stop != CASE
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WHEN p.subclass IN ('bus_stop', 'bus_station', 'tram_stop', 'subway')
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THEN 1
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END;
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UPDATE osm_poi_point p
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SET
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agg_stop = (
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CASE
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WHEN p.subclass IN ('bus_stop', 'bus_station', 'tram_stop', 'subway')
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AND r.rk IS NULL OR r.rk = 1
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THEN 1
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END)
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FROM osm_poi_stop_rank r
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WHERE p.osm_id = r.osm_id AND
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agg_stop != (
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CASE
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WHEN p.subclass IN ('bus_stop', 'bus_station', 'tram_stop', 'subway')
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AND r.rk IS NULL OR r.rk = 1
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THEN 1
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END);
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END;
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$$ LANGUAGE plpgsql;
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ALTER TABLE osm_poi_point
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ADD COLUMN IF NOT EXISTS agg_stop integer DEFAULT NULL;
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SELECT update_osm_poi_point_agg();
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-- Handle updates
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CREATE SCHEMA IF NOT EXISTS poi_point;
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CREATE TABLE IF NOT EXISTS poi_point.updates
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(
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id serial PRIMARY KEY,
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t text,
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UNIQUE (t)
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);
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CREATE OR REPLACE FUNCTION poi_point.flag() RETURNS trigger AS
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$$
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BEGIN
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INSERT INTO poi_point.updates(t) VALUES ('y') ON CONFLICT(t) DO NOTHING;
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RETURN NULL;
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END;
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$$ LANGUAGE plpgsql;
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CREATE OR REPLACE FUNCTION poi_point.refresh() RETURNS trigger AS
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$$
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DECLARE
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t TIMESTAMP WITH TIME ZONE := clock_timestamp();
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BEGIN
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RAISE LOG 'Refresh poi_point';
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PERFORM update_osm_poi_point();
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REFRESH MATERIALIZED VIEW osm_poi_stop_centroid;
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REFRESH MATERIALIZED VIEW osm_poi_stop_rank;
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PERFORM update_osm_poi_point_agg();
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-- noinspection SqlWithoutWhere
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DELETE FROM poi_point.updates;
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RAISE LOG 'Refresh poi_point done in %', age(clock_timestamp(), t);
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RETURN NULL;
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END;
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$$ LANGUAGE plpgsql;
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CREATE TRIGGER trigger_flag
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AFTER INSERT OR UPDATE OR DELETE
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ON osm_poi_point
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FOR EACH STATEMENT
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EXECUTE PROCEDURE poi_point.flag();
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CREATE CONSTRAINT TRIGGER trigger_refresh
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AFTER INSERT
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ON poi_point.updates
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INITIALLY DEFERRED
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FOR EACH ROW
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EXECUTE PROCEDURE poi_point.refresh();
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