2b95d1cffa
* All functions that access database must be declared as `STABLE`, not `IMMUTABLE` -- because database can change at any moment, e.g. during an update * there are a few functions that could be made `STRICT` -- passing `NULL` as a parameter will always result in a `NULL`, but for some reason that causes a significant decrease in perf. * tagged one function as parallel safe NOTE: somehow `ST_AsMVT()` method of tile generation is showing 70-90% slowdown with this patch. I am not sure of why this is happening. If the reason is the `IMMUTABLE` -> `STABLE` change, we may have to dig deeper into PG optimization
80 lines
3.3 KiB
PL/PgSQL
80 lines
3.3 KiB
PL/PgSQL
-- etldoc: layer_city[shape=record fillcolor=lightpink, style="rounded,filled",
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-- etldoc: label="layer_city | <z2_14> z2-z14+" ] ;
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-- etldoc: osm_city_point -> layer_city:z2_14
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CREATE OR REPLACE FUNCTION layer_city(bbox geometry, zoom_level int, pixel_width numeric)
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RETURNS TABLE
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(
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osm_id bigint,
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geometry geometry,
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name text,
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name_en text,
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name_de text,
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tags hstore,
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place city_place,
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"rank" int,
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capital int
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)
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AS
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$$
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SELECT *
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FROM (
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SELECT osm_id,
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geometry,
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name,
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COALESCE(NULLIF(name_en, ''), name) AS name_en,
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COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
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tags,
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place,
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"rank",
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normalize_capital_level(capital) AS capital
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FROM osm_city_point
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WHERE geometry && bbox
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AND ((zoom_level = 2 AND "rank" = 1)
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OR (zoom_level BETWEEN 3 AND 7 AND "rank" <= zoom_level + 1)
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)
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UNION ALL
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SELECT osm_id,
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geometry,
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name,
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COALESCE(NULLIF(name_en, ''), name) AS name_en,
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COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
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tags,
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place,
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COALESCE("rank", gridrank + 10),
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normalize_capital_level(capital) AS capital
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FROM (
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SELECT osm_id,
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geometry,
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name,
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COALESCE(NULLIF(name_en, ''), name) AS name_en,
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COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
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tags,
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place,
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"rank",
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capital,
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row_number() OVER (
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PARTITION BY LabelGrid(geometry, 128 * pixel_width)
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ORDER BY "rank" ASC NULLS LAST,
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place ASC NULLS LAST,
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population DESC NULLS LAST,
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length(name) ASC
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)::int AS gridrank
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FROM osm_city_point
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WHERE geometry && bbox
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AND ((zoom_level = 7 AND place <= 'town'::city_place
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OR (zoom_level BETWEEN 8 AND 10 AND place <= 'village'::city_place)
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OR (zoom_level BETWEEN 11 AND 13 AND place <= 'suburb'::city_place)
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OR (zoom_level >= 14)
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))
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) AS ranked_places
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WHERE (zoom_level BETWEEN 7 AND 8 AND (gridrank <= 4 OR "rank" IS NOT NULL))
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OR (zoom_level = 9 AND (gridrank <= 8 OR "rank" IS NOT NULL))
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OR (zoom_level = 10 AND (gridrank <= 12 OR "rank" IS NOT NULL))
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OR (zoom_level BETWEEN 11 AND 12 AND (gridrank <= 14 OR "rank" IS NOT NULL))
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OR (zoom_level >= 13)
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) AS city_all;
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$$ LANGUAGE SQL STABLE
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-- STRICT
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PARALLEL SAFE;
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