41 lines
1.7 KiB
PL/PgSQL
41 lines
1.7 KiB
PL/PgSQL
DROP FUNCTION IF EXISTS layer_obs_roads(geometry, int);
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CREATE OR REPLACE FUNCTION layer_obs_roads(bbox geometry, zoom_level int)
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RETURNS TABLE(
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way_id bigint,
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geometry geometry,
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distance_overtaker_mean float,
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distance_overtaker_min float,
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distance_overtaker_max float,
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distance_overtaker_median float,
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distance_overtaker_array float[],
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overtaking_event_count int,
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usage_count bigint,
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direction int,
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offset_direction int
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) 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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min(distance_overtaker) as distance_overtaker_min,
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max(distance_overtaker) as distance_overtaker_max,
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PERCENTILE_CONT(0.5) WITHIN GROUP (ORDER BY distance_overtaker) as distance_overtaker_median,
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array_agg(distance_overtaker) as distance_overtaker_array,
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count(overtaking_event.id)::int as distance_overtaker_count,
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(select count(id) from road_usage where road_usage.way_id = road.way_id and
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(road.directionality != 0 or road_usage.direction_reversed = r.rev)) as usage_count,
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r.dir as direction,
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case when road.directionality = 0 then r.dir else 0 end as offset_direction
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FROM road
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LEFT JOIN (VALUES (-1, TRUE), (1, FALSE), (0, FALSE)) AS r(dir, rev) ON (abs(r.dir) != road.directionality)
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FULL OUTER JOIN overtaking_event ON (road.way_id = overtaking_event.way_id and (road.directionality != 0 or overtaking_event.direction_reversed = r.rev))
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-- WHERE road.name = 'Merzhauser Straße'
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WHERE
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zoom_level >= 10 AND
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road.geometry && bbox
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GROUP BY road.name, road.way_id, road.geometry, road.directionality, r.dir, r.rev;
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$$ LANGUAGE SQL IMMUTABLE;
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