27 lines
886 B
MySQL
27 lines
886 B
MySQL
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DROP FUNCTION IF EXISTS layer_obs_regions(geometry, int);
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CREATE OR REPLACE FUNCTION layer_obs_regions(bbox geometry, zoom_level int)
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RETURNS TABLE(
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region_id bigint,
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geometry geometry,
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name text,
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admin_level int,
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overtaking_event_count int
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) AS $$
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SELECT
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region.relation_id::bigint as region_id,
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ST_SimplifyPreserveTopology(region.geometry, ZRes(zoom_level + 2)) as geometry,
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region.name as name,
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region.admin_level as admin_level,
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count(overtaking_event.id)::int as overtaking_event_count
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FROM region
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LEFT JOIN overtaking_event on ST_Within(ST_Transform(overtaking_event.geometry, 3857), region.geometry)
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WHERE
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zoom_level >= 4 AND
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zoom_level <= 12 AND
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ST_Transform(region.geometry, 3857) && bbox
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GROUP BY region.relation_id, region.name, region.geometry, region.admin_level
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$$ LANGUAGE SQL IMMUTABLE;
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