90 lines
3.1 KiB
PL/PgSQL
90 lines
3.1 KiB
PL/PgSQL
-- etldoc: layer_lm[shape=record fillcolor=lightpink, style="rounded,filled",
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-- etldoc: label="layer_lm | <z12> z12 | <z13> z13 | <z14_> z14+" ] ;
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CREATE OR REPLACE FUNCTION layer_lm(bbox geometry, zoom_level integer, 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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class text,
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subclass text,
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agg_stop integer,
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layer integer,
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level integer,
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"rank" int
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)
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AS
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$$
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SELECT osm_id_hash AS osm_id,
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geometry,
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NULLIF(name, '') AS 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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lm_class(subclass, mapping_key) AS class,
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subclass AS subclass,
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agg_stop,
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NULLIF(layer, 0) AS layer,
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"level",
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row_number() OVER (
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PARTITION BY LabelGrid(geometry, 100 * pixel_width)
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ORDER BY CASE WHEN name = '' THEN 2000 ELSE lm_class_rank(lm_class(subclass, mapping_key)) END ASC
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)::int AS "rank"
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FROM (
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-- etldoc: osm_lm_point -> layer_lm:z12
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-- etldoc: osm_lm_point -> layer_lm:z13
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SELECT *,
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osm_id * 10 AS osm_id_hash
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FROM osm_lm_point
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WHERE geometry && bbox
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AND zoom_level BETWEEN 12 AND 13
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AND ((subclass = 'station' AND mapping_key = 'railway')
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OR subclass IN ('halt', 'ferry_terminal'))
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UNION ALL
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-- etldoc: osm_lm_point -> layer_lm:z14_
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SELECT *,
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osm_id * 10 AS osm_id_hash
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FROM osm_lm_point
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WHERE geometry && bbox
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AND zoom_level >= 14
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UNION ALL
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-- etldoc: osm_lm_polygon -> layer_lm:z12
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-- etldoc: osm_lm_polygon -> layer_lm:z13
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SELECT *,
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NULL::integer AS agg_stop,
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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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FROM osm_lm_polygon
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WHERE geometry && bbox
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AND zoom_level BETWEEN 12 AND 13
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AND ((subclass = 'station' AND mapping_key = 'railway')
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OR subclass IN ('halt', 'ferry_terminal'))
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UNION ALL
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-- etldoc: osm_lm_polygon -> layer_lm:z14_
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SELECT *,
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NULL::integer AS agg_stop,
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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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FROM osm_lm_polygon
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WHERE geometry && bbox
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AND zoom_level >= 14
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) AS lm_union
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ORDER BY "rank"
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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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