openmaptiles/layers/transportation_name/layer.sql

-- etldoc: layer_transportation_name[shape=record fillcolor=lightpink, style="rounded,filled",
-- etldoc:     label="layer_transportation_name | <z6> z6 | <z7> z7 | <z8> z8 |<z9> z9 |<z10> z10 |<z11> z11 |<z12> z12|<z13> z13|<z14_> z14+" ] ;

CREATE OR REPLACE FUNCTION layer_transportation_name(bbox geometry, zoom_level integer)
    RETURNS TABLE
            (
                osm_id     bigint,
                geometry   geometry,
                name       text,
                name_en    text,
                name_de    text,
                tags       hstore,
                ref        text,
                ref_length int,
                network    text,
                class      text,
                subclass   text,
                layer      int,
                level      int,
                indoor     int
            )
AS
$$
SELECT osm_id,
       geometry,
       NULLIF(name, '')                             AS name,
       COALESCE(NULLIF(name_en, ''), name)          AS name_en,
       COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
       tags,
       NULLIF(ref, ''),
       NULLIF(LENGTH(ref), 0)                       AS ref_length,
       --TODO: The road network of the road is not yet implemented
       CASE
           WHEN network IS NOT NULL
               THEN network::text
           WHEN length(coalesce(ref, '')) > 0
               THEN 'road'
           END                                      AS network,
       highway_class(highway, '', construction)     AS class,
       CASE
           WHEN highway IS NOT NULL AND highway_class(highway, '', construction) = 'path'
               THEN highway
           END                                      AS subclass,
       NULLIF(layer, 0)                             AS layer,
       "level",
       CASE WHEN indoor = TRUE THEN 1 END           AS indoor
FROM (

         -- etldoc: osm_transportation_name_linestring_gen4 ->  layer_transportation_name:z6
         SELECT *,
                NULL::int     AS layer,
                NULL::int     AS level,
                NULL::boolean AS indoor
         FROM osm_transportation_name_linestring_gen4
         WHERE zoom_level = 6
         UNION ALL

         -- etldoc: osm_transportation_name_linestring_gen3 ->  layer_transportation_name:z7
         SELECT *,
                NULL::int     AS layer,
                NULL::int     AS level,
                NULL::boolean AS indoor
         FROM osm_transportation_name_linestring_gen3
         WHERE zoom_level = 7
         UNION ALL

         -- etldoc: osm_transportation_name_linestring_gen2 ->  layer_transportation_name:z8
         SELECT *,
                NULL::int     AS layer,
                NULL::int     AS level,
                NULL::boolean AS indoor
         FROM osm_transportation_name_linestring_gen2
         WHERE zoom_level = 8
         UNION ALL

         -- etldoc: osm_transportation_name_linestring_gen1 ->  layer_transportation_name:z9
         -- etldoc: osm_transportation_name_linestring_gen1 ->  layer_transportation_name:z10
         -- etldoc: osm_transportation_name_linestring_gen1 ->  layer_transportation_name:z11
         SELECT *,
                NULL::int     AS layer,
                NULL::int     AS level,
                NULL::boolean AS indoor
         FROM osm_transportation_name_linestring_gen1
         WHERE zoom_level BETWEEN 9 AND 11
         UNION ALL

         -- etldoc: osm_transportation_name_linestring ->  layer_transportation_name:z12
         SELECT geometry,
                osm_id,
                name,
                name_en,
                name_de,
                "tags",
                ref,
                highway,
                construction,
                network,
                z_order,
                layer,
                "level",
                indoor
         FROM osm_transportation_name_linestring
         WHERE zoom_level = 12
           AND LineLabel(zoom_level, COALESCE(NULLIF(name, ''), ref), geometry)
           AND highway_class(highway, '', construction) NOT IN ('minor', 'track', 'path')
           AND NOT highway_is_link(highway)
         UNION ALL

         -- etldoc: osm_transportation_name_linestring ->  layer_transportation_name:z13
         SELECT geometry,
                osm_id,
                name,
                name_en,
                name_de,
                "tags",
                ref,
                highway,
                construction,
                network,
                z_order,
                layer,
                "level",
                indoor
         FROM osm_transportation_name_linestring
         WHERE zoom_level = 13
           AND LineLabel(zoom_level, COALESCE(NULLIF(name, ''), ref), geometry)
           AND highway_class(highway, '', construction) NOT IN ('track', 'path')
         UNION ALL

         -- etldoc: osm_transportation_name_linestring ->  layer_transportation_name:z14_
         SELECT geometry,
                osm_id,
                name,
                name_en,
                name_de,
                "tags",
                ref,
                highway,
                construction,
                network,
                z_order,
                layer,
                "level",
                indoor
         FROM osm_transportation_name_linestring
         WHERE zoom_level >= 14
     ) AS zoom_levels
WHERE geometry && bbox
ORDER BY z_order ASC;
$$ LANGUAGE SQL STABLE
                -- STRICT
                PARALLEL SAFE;