openmaptiles/layers_addons/tree/layer.sql

-- etldoc: layer_tree[shape=record fillcolor=lightpink,
-- etldoc:     style="rounded,filled", label="layer_tree | <z14_> z14+" ] ;
CREATE OR REPLACE FUNCTION layer_tree(bbox geometry, zoom_level integer, pixel_width numeric)
RETURNS TABLE(
    osm_id bigint,
    geometry geometry,
    leaf_type text
) AS $$
    -- etldoc: osm_tree -> layer_tree:z14_
    SELECT osm_id, geometry, leaf_type
    FROM osm_tree
    WHERE zoom_level >= 14
      AND geometry && bbox;
$$ LANGUAGE SQL STABLE
                -- STRICT
                PARALLEL SAFE;