Mercurial > gemma
view schema/search_functions.sql @ 4161:64cd18281c76
Improve performance of row level security policies
Using constraint_column_usage instead of key_column_usage makes
the query twice as fast. I did not explore why. Let's just take it.
Using 'EXISTS(... WHERE ... = value) is often more efficient than
value IN(...) since it allows the inner query to be executed only
up to the point where it turns out to return more than nothing with
filtering directly in place.
author | Tom Gottfried <tom@intevation.de> |
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date | Fri, 02 Aug 2019 17:14:13 +0200 |
parents | b10f210af325 |
children | 5e38667f740c |
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-- This is Free Software under GNU Affero General Public License v >= 3.0 -- without warranty, see README.md and license for details. -- SPDX-License-Identifier: AGPL-3.0-or-later -- License-Filename: LICENSES/AGPL-3.0.txt -- Copyright (C) 2018,2019 by via donau -- – Österreichische Wasserstraßen-Gesellschaft mbH -- Software engineering by Intevation GmbH -- Author(s): -- * Sascha Wilde <wilde@intevation.de> CREATE OR REPLACE FUNCTION search_hectometre(search_string text) RETURNS jsonb LANGUAGE plpgsql STABLE PARALLEL SAFE AS $$ DECLARE _result jsonb; BEGIN IF search_string SIMILAR TO '[0-9]+' THEN SELECT COALESCE(json_agg(r),'[]') INTO _result FROM (SELECT (location_code).hectometre || ' rhm' AS name, isrs_asText(location_code) AS locationcode, wwname AS location, ST_AsGeoJSON(geom)::json AS geom, 'rhm' AS type FROM waterway.distance_marks_virtual WHERE (location_code).hectometre = search_string::int) r; ELSIF is_ISRSstring(search_string) THEN SELECT COALESCE(json_agg(r),'[]') INTO _result FROM (SELECT (location_code).hectometre || ' rhm' AS name, isrs_asText(location_code) AS locationcode, wwname AS location, ST_AsGeoJSON(geom)::json AS geom, 'rhm' AS type FROM waterway.distance_marks_virtual WHERE location_code = isrs_fromText(search_string)) r; ELSE _result='[]'; END IF; RETURN _result; END; $$; CREATE OR REPLACE FUNCTION search_bottlenecks(search_string text) RETURNS jsonb LANGUAGE plpgsql STABLE PARALLEL SAFE AS $$ DECLARE _result jsonb; BEGIN SELECT COALESCE(json_agg(r),'[]') INTO _result FROM (SELECT objnam AS name, ST_AsGeoJSON(ST_Envelope(area::geometry))::json AS geom, 'bottleneck' AS type FROM waterway.bottlenecks WHERE objnam ILIKE '%' || search_string || '%' AND validity @> now() ORDER BY name) r; RETURN _result; END; $$; CREATE OR REPLACE FUNCTION search_cities(search_string text) RETURNS jsonb LANGUAGE plpgsql STABLE PARALLEL SAFE AS $$ DECLARE _result jsonb; BEGIN SELECT COALESCE(json_agg(r),'[]') INTO _result FROM (SELECT name, country_code AS location, ST_AsGeoJSON(location)::json AS geom, 'city' AS type FROM waterway.geonames WHERE feature_code IN ('PPLA', 'PPLA1', 'PPLA2', 'PPLA3', 'PPLC') AND (name ILIKE '%' || search_string || '%' OR alternatenames ~* ('(^|,)' || search_string || '($|,)')) ORDER BY array_position(ARRAY['PPLC', 'PPLA', 'PPLA1', 'PPLA2', 'PPLA3'], feature_code::text), name) r; RETURN _result; END; $$; CREATE OR REPLACE FUNCTION search_gauges(search_string text) RETURNS jsonb LANGUAGE plpgsql STABLE PARALLEL SAFE AS $$ DECLARE _result jsonb; BEGIN IF is_ISRSstring(search_string) THEN SELECT COALESCE(json_agg(r),'[]') INTO _result FROM ( SELECT objname AS name, ST_AsGeoJSON(geom)::json AS geom, 'gauge' AS type, isrs_asText(location) AS locationcode FROM waterway.gauges WHERE NOT erased AND location = isrs_fromText(search_string) ORDER BY name) r; ELSE SELECT COALESCE(json_agg(r),'[]') INTO _result FROM ( SELECT objname AS name, ST_AsGeoJSON(geom)::json AS geom, 'gauge' AS type, isrs_asText(location) AS locationcode FROM waterway.gauges WHERE NOT erased AND objname ILIKE '%' || search_string || '%' ORDER BY name) r; END IF; RETURN _result; END; $$; CREATE OR REPLACE FUNCTION search_sections(search_string text) RETURNS jsonb LANGUAGE plpgsql STABLE PARALLEL SAFE AS $$ DECLARE _result jsonb; BEGIN SELECT COALESCE(json_agg(r),'[]') INTO _result FROM (SELECT id, objnam AS name, ST_AsGeoJSON(ST_Envelope(area::geometry))::json AS geom, 'section' AS type FROM waterway.sections WHERE objnam ILIKE '%' || search_string || '%' OR nobjnam ILIKE '%' || search_string || '%' ORDER BY name) r; RETURN _result; END; $$; CREATE OR REPLACE FUNCTION search_stretches(search_string text) RETURNS jsonb LANGUAGE plpgsql STABLE PARALLEL SAFE AS $$ DECLARE _result jsonb; BEGIN SELECT COALESCE(json_agg(r),'[]') INTO _result FROM (SELECT id, objnam AS name, ST_AsGeoJSON(ST_Envelope(area::geometry))::json AS geom, 'stretch' AS type FROM waterway.stretches WHERE objnam ILIKE '%' || search_string || '%' OR nobjnam ILIKE '%' || search_string || '%' ORDER BY name) r; RETURN _result; END; $$; CREATE OR REPLACE FUNCTION search_most(search_string text) RETURNS jsonb LANGUAGE plpgsql STABLE PARALLEL SAFE AS $$ BEGIN RETURN search_hectometre(search_string) || search_bottlenecks(search_string) || search_gauges(search_string) || search_sections(search_string) || search_stretches(search_string) || search_cities(search_string); END; $$;