e6a1000155
Some of the `update_osm_${LAYER}`-functions, which are executed by triggers on updates, execute an UPDATE statement on the same tables that have these triggers. This causes the trigger functions `flag` and `store` to run multiple times for one record.
For instance, if I add log in the trigger functions and run an INSERT on `osm_housenumber_point`, this output is generated:
```
NOTICE: Store
NOTICE: Flag
NOTICE: Refresh housenumber
NOTICE: Flag
NOTICE: Store
NOTICE: Flag
INSERT 0 1
```
If we limit the triggers from executing if they are called from another trigger using `pg_trigger_depth() < 1`, the triggers will only be triggered once per record:
```
NOTICE: Store
NOTICE: Flag
NOTICE: Refresh housenumber
INSERT 0 1
```
This will prevent redunant executions and might improve update performance.
Co-authored-by: Patrik Sylve <patrik.sylve@t-kartor.com>
90 lines
2.6 KiB
PL/PgSQL
90 lines
2.6 KiB
PL/PgSQL
DROP TRIGGER IF EXISTS trigger_flag ON osm_continent_point;
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DROP TRIGGER IF EXISTS trigger_store ON osm_continent_point;
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DROP TRIGGER IF EXISTS trigger_refresh ON place_continent_point.updates;
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CREATE SCHEMA IF NOT EXISTS place_continent_point;
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CREATE TABLE IF NOT EXISTS place_continent_point.osm_ids
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(
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osm_id bigint PRIMARY KEY
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);
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-- etldoc: osm_continent_point -> osm_continent_point
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CREATE OR REPLACE FUNCTION update_osm_continent_point(full_update boolean) RETURNS void AS
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$$
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UPDATE osm_continent_point
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SET tags = update_tags(tags, geometry)
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WHERE (full_update OR osm_id IN (SELECT osm_id FROM place_continent_point.osm_ids))
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AND COALESCE(tags->'name:latin', tags->'name:nonlatin', tags->'name_int') IS NULL
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AND tags != update_tags(tags, geometry);
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$$ LANGUAGE SQL;
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SELECT update_osm_continent_point(true);
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-- Handle updates
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CREATE OR REPLACE FUNCTION place_continent_point.store() RETURNS trigger AS
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$$
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BEGIN
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INSERT INTO place_continent_point.osm_ids VALUES (NEW.osm_id) ON CONFLICT (osm_id) DO NOTHING;
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RETURN NULL;
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END;
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$$ LANGUAGE plpgsql;
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CREATE TABLE IF NOT EXISTS place_continent_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 place_continent_point.flag() RETURNS trigger AS
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$$
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BEGIN
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INSERT INTO place_continent_point.updates(t) VALUES ('y') ON CONFLICT(t) DO NOTHING;
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RETURN NULL;
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END;
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$$ LANGUAGE plpgsql;
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CREATE OR REPLACE FUNCTION place_continent_point.refresh() RETURNS trigger AS
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$$
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DECLARE
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t TIMESTAMP WITH TIME ZONE := clock_timestamp();
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BEGIN
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RAISE LOG 'Refresh place_continent_point';
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-- Analyze tracking and source tables before performing update
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ANALYZE place_continent_point.osm_ids;
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ANALYZE osm_continent_point;
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PERFORM update_osm_continent_point(false);
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-- noinspection SqlWithoutWhere
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DELETE FROM place_continent_point.osm_ids;
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-- noinspection SqlWithoutWhere
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DELETE FROM place_continent_point.updates;
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RAISE LOG 'Refresh place_continent_point done in %', age(clock_timestamp(), t);
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RETURN NULL;
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END;
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$$ LANGUAGE plpgsql;
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CREATE TRIGGER trigger_store
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AFTER INSERT OR UPDATE
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ON osm_continent_point
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FOR EACH ROW
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WHEN (pg_trigger_depth() < 1)
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EXECUTE PROCEDURE place_continent_point.store();
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CREATE TRIGGER trigger_flag
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AFTER INSERT OR UPDATE
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ON osm_continent_point
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FOR EACH STATEMENT
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WHEN (pg_trigger_depth() < 1)
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EXECUTE PROCEDURE place_continent_point.flag();
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CREATE CONSTRAINT TRIGGER trigger_refresh
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AFTER INSERT
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ON place_continent_point.updates
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INITIALLY DEFERRED
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FOR EACH ROW
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EXECUTE PROCEDURE place_continent_point.refresh();
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