-- etldoc: layer_aeroway[shape=record fillcolor=lightpink, style="rounded,filled",
-- etldoc:     label="layer_aeroway |<z10> z10|<z11> z11|<z12> z12|<z13> z13|<z14_> z14+" ];

CREATE OR REPLACE FUNCTION layer_aeroway(bbox geometry, zoom_level int)
    RETURNS TABLE
            (
                geometry geometry,
                class    text,
                ref      text
            )
AS
$$
SELECT geometry, aeroway AS class, ref
FROM (
         -- etldoc:  osm_aeroway_linestring_gen3 -> layer_aeroway:z10
         SELECT geometry, aeroway, ref
         FROM osm_aeroway_linestring_gen3
         WHERE zoom_level = 10
         UNION ALL
         -- etldoc:  osm_aeroway_linestring_gen2 -> layer_aeroway:z11
         SELECT geometry, aeroway, ref
         FROM osm_aeroway_linestring_gen2
         WHERE zoom_level = 11
         UNION ALL
         -- etldoc:  osm_aeroway_linestring_gen1 -> layer_aeroway:z12
         SELECT geometry, aeroway, ref
         FROM osm_aeroway_linestring_gen1
         WHERE zoom_level = 12
         UNION ALL
         -- etldoc:  osm_aeroway_linestring -> layer_aeroway:z13
         -- etldoc:  osm_aeroway_linestring -> layer_aeroway:z14_
         SELECT geometry, aeroway, ref
         FROM osm_aeroway_linestring
         WHERE zoom_level >= 13
         UNION ALL

         -- etldoc:  osm_aeroway_polygon_gen3 -> layer_aeroway:z10
         -- etldoc:  osm_aeroway_polygon_gen3 -> layer_aeroway:z11
         SELECT geometry, aeroway, ref
         FROM osm_aeroway_polygon_gen3
         WHERE zoom_level BETWEEN 10 AND 11
         UNION ALL
         -- etldoc:  osm_aeroway_polygon_gen2 -> layer_aeroway:z12
         SELECT geometry, aeroway, ref
         FROM osm_aeroway_polygon_gen2
         WHERE zoom_level = 12
         UNION ALL
         -- etldoc:  osm_aeroway_polygon_gen1 -> layer_aeroway:z13
         SELECT geometry, aeroway, ref
         FROM osm_aeroway_polygon_gen1
         WHERE zoom_level = 13
         UNION ALL
         -- etldoc:  osm_aeroway_polygon -> layer_aeroway:z14_
         SELECT geometry, aeroway, ref
         FROM osm_aeroway_polygon
         WHERE zoom_level >= 14
     ) AS zoom_levels
WHERE geometry && bbox;
$$ LANGUAGE SQL STABLE
                -- STRICT
                PARALLEL SAFE;
