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
2.8 KiB
PL/PgSQL
80 lines
2.8 KiB
PL/PgSQL
-- etldoc: layer_water_name[shape=record fillcolor=lightpink, style="rounded,filled",
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-- etldoc: label="layer_water_name | <z0_8> z0_8 | <z9_13> z9_13 | <z14_> z14+" ] ;
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CREATE OR REPLACE FUNCTION layer_water_name(bbox geometry, zoom_level integer)
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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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class text,
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intermittent 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_water_lakeline -> layer_water_name:z9_13
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-- etldoc: osm_water_lakeline -> layer_water_name:z14_
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CASE
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WHEN osm_id < 0 THEN -osm_id * 10 + 4
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ELSE osm_id * 10 + 1
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END AS osm_id_hash,
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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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'lake'::text AS class,
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is_intermittent::int AS intermittent
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FROM osm_water_lakeline
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WHERE geometry && bbox
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AND ((zoom_level BETWEEN 9 AND 13 AND LineLabel(zoom_level, NULLIF(name, ''), geometry))
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OR (zoom_level >= 14))
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UNION ALL
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SELECT
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-- etldoc: osm_water_point -> layer_water_name:z9_13
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-- etldoc: osm_water_point -> layer_water_name:z14_
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CASE
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WHEN osm_id < 0 THEN -osm_id * 10 + 4
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ELSE osm_id * 10 + 1
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END AS osm_id_hash,
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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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'lake'::text AS class,
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is_intermittent::int AS intermittent
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FROM osm_water_point
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WHERE geometry && bbox
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AND (
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(zoom_level BETWEEN 9 AND 13 AND area > 70000 * 2 ^ (20 - zoom_level))
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OR (zoom_level >= 14)
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)
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UNION ALL
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SELECT
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-- etldoc: osm_marine_point -> layer_water_name:z0_8
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-- etldoc: osm_marine_point -> layer_water_name:z9_13
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-- etldoc: osm_marine_point -> layer_water_name:z14_
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osm_id * 10 AS osm_id_hash,
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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::text AS class,
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is_intermittent::int AS intermittent
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FROM osm_marine_point
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WHERE geometry && bbox
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AND (
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place = 'ocean'
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OR (zoom_level >= "rank" AND "rank" IS NOT NULL)
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OR (zoom_level >= 8)
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);
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$$ LANGUAGE SQL STABLE
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-- STRICT
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PARALLEL SAFE;
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