16 lines
635 B
MySQL
16 lines
635 B
MySQL
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CREATE OR REPLACE FUNCTION layer_obs_roads(bbox geometry, zoom_level int)
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RETURNS TABLE(way_id bigint, geometry geometry, distance_overtaker_mean float, direction int) AS $$
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SELECT
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road.way_id::bigint as way_id,
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road.geometry as geometry,
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avg(distance_overtaker) as distance_overtaker_mean,
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r.dir as direction
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FROM road
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JOIN overtaking_event on road.way_id = overtaking_event.way_id
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JOIN (VALUES (1, TRUE), (-1, FALSE)) AS r(dir, rev) ON overtaking_event.direction_reversed = r.rev
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WHERE road.geometry && bbox
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GROUP BY road.way_id, road.geometry, direction;
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$$ LANGUAGE SQL IMMUTABLE;
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