31 lines
1.1 KiB
PL/PgSQL
31 lines
1.1 KiB
PL/PgSQL
CREATE OR REPLACE FUNCTION railway_class(railway text, service text) RETURNS TEXT AS $$
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SELECT CASE
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WHEN railway='rail' AND service='' THEN 'rail'
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ELSE 'minor_rail'
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END;
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$$ LANGUAGE SQL IMMUTABLE;
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CREATE OR REPLACE FUNCTION railway_brunnel(is_bridge boolean, is_tunnel boolean) RETURNS TEXT AS $$
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SELECT CASE
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WHEN is_bridge THEN 'bridge'
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WHEN is_tunnel THEN 'tunnel'
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ELSE NULL
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END;
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$$ LANGUAGE SQL IMMUTABLE;
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CREATE OR REPLACE FUNCTION layer_railway(bbox geometry, zoom_level int)
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RETURNS TABLE(osm_id bigint, geometry geometry, class text, subclass text, properties railway_properties) AS $$
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SELECT osm_id, geometry,
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railway_class(railway, service) AS class,
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railway AS subclass,
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to_railway_properties(is_bridge, is_tunnel) AS properties
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FROM (
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SELECT * FROM osm_railway_linestring
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WHERE zoom_level = 13 AND railway = 'rail' AND service=''
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UNION ALL
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SELECT * FROM osm_railway_linestring WHERE zoom_level >= 14
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) AS zoom_levels
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WHERE geometry && bbox
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ORDER BY z_order ASC;
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$$ LANGUAGE SQL IMMUTABLE;
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