16 lines
805 B
PL/PgSQL
16 lines
805 B
PL/PgSQL
CREATE OR REPLACE FUNCTION layer_highway_name(bbox geometry, zoom_level integer)
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RETURNS TABLE(osm_id bigint, geometry geometry, name text, class highway_class, subclass text) AS $$
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SELECT osm_id, geometry, name, to_highway_class(highway) AS class, highway AS subclass FROM (
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SELECT * FROM osm_highway_name_linestring
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WHERE zoom_level = 12 AND to_highway_class(highway) < 'minor_road'::highway_class AND NOT highway_is_link(highway)
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UNION ALL
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SELECT * FROM osm_highway_name_linestring
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WHERE zoom_level = 13 AND to_highway_class(highway) < 'path'::highway_class
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UNION ALL
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SELECT * FROM osm_highway_name_linestring
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WHERE zoom_level >= 14
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) AS zoom_levels
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WHERE geometry && bbox
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ORDER BY z_order ASC;
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$$ LANGUAGE SQL IMMUTABLE;
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