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
63 lines
2.3 KiB
PL/PgSQL
63 lines
2.3 KiB
PL/PgSQL
-- etldoc: layer_mountain_peak[shape=record fillcolor=lightpink,
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-- etldoc: style="rounded,filled", label="layer_mountain_peak | <z7_> z7+" ] ;
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CREATE OR REPLACE FUNCTION layer_mountain_peak(bbox geometry,
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zoom_level integer,
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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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class text,
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tags hstore,
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ele int,
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ele_ft int,
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"rank" int
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)
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AS
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$$
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SELECT
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-- etldoc: osm_peak_point -> layer_mountain_peak:z7_
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osm_id,
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geometry,
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name,
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name_en,
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name_de,
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tags->'natural' AS class,
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tags,
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ele::int,
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ele_ft::int,
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rank::int
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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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substring(ele FROM E'^(-?\\d+)(\\D|$)')::int AS ele,
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round(substring(ele FROM E'^(-?\\d+)(\\D|$)')::int * 3.2808399)::int AS ele_ft,
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row_number() OVER (
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PARTITION BY LabelGrid(geometry, 100 * pixel_width)
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ORDER BY (
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substring(ele FROM E'^(-?\\d+)(\\D|$)')::int +
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(CASE WHEN NULLIF(wikipedia, '') IS NOT NULL THEN 10000 ELSE 0 END) +
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(CASE WHEN NULLIF(name, '') IS NOT NULL THEN 10000 ELSE 0 END)
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) DESC
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)::int AS "rank"
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FROM osm_peak_point
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WHERE geometry && bbox
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AND ele IS NOT NULL
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AND ele ~ E'^-?\\d{1,4}(\\D|$)'
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) AS ranked_peaks
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WHERE zoom_level >= 7
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AND (rank <= 5 OR zoom_level >= 14)
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ORDER BY "rank" ASC;
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$$ LANGUAGE SQL STABLE
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PARALLEL SAFE;
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-- TODO: Check if the above can be made STRICT -- i.e. if pixel_width could be NULL
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