Implement shipway labels (#1179)

Fixes #403 

This PR adds labels to shipway linestrings in the `transportation_name` level, up through zoom 12.

![image](https://user-images.githubusercontent.com/3254090/129659827-662ee13c-27f3-4e62-a7f4-45dbd535b770.png)

layers/transportation_name/transportation_name.sql

@@ -110,7 +110,7 @@ FROM (
          FROM osm_transportation_name_linestring
          WHERE zoom_level = 12
            AND LineLabel(zoom_level, COALESCE(name, ref), geometry)
-           AND highway_class(highway, '', subclass) NOT IN ('minor', 'track', 'path')
+           AND (highway_class(highway, '', subclass) NOT IN ('minor', 'track', 'path') OR highway='shipway')
            AND NOT highway_is_link(highway)
          UNION ALL
 
@@ -133,7 +133,7 @@ FROM (
          FROM osm_transportation_name_linestring
          WHERE zoom_level = 13
            AND LineLabel(zoom_level, COALESCE(name, ref), geometry)
-           AND highway_class(highway, '', subclass) NOT IN ('track', 'path')
+           AND (highway_class(highway, '', subclass) NOT IN ('track', 'path') OR highway='shipway')
          UNION ALL
 
          -- etldoc: osm_transportation_name_linestring ->  layer_transportation_name:z14_

layers/transportation_name/update_transportation_name.sql

@@ -66,6 +66,7 @@ CREATE INDEX IF NOT EXISTS osm_transportation_name_network_geometry_idx ON osm_t
 
 
 -- etldoc: osm_transportation_name_network ->  osm_transportation_name_linestring
+-- etldoc: osm_shipway_linestring ->  osm_transportation_name_linestring
 CREATE TABLE IF NOT EXISTS osm_transportation_name_linestring AS
 SELECT (ST_Dump(geometry)).geom AS geometry,
        name,
@@ -105,6 +106,31 @@ FROM (
          WHERE name <> '' OR ref <> ''
          GROUP BY name, name_en, name_de, tags, ref, highway, subclass, "level", layer, indoor, network_type,
                   route_1, route_2, route_3, route_4, route_5, route_6
+         UNION ALL
+
+         SELECT ST_LineMerge(ST_Collect(geometry)) AS geometry,
+                CASE WHEN length(name) > 15 THEN osml10n_street_abbrev_all(name) ELSE NULLIF(name, '') END AS "name",
+                CASE WHEN length(name_en) > 15 THEN osml10n_street_abbrev_en(name_en) ELSE NULLIF(name_en, '') END AS "name_en",
+                CASE WHEN length(name_de) > 15 THEN osml10n_street_abbrev_de(name_de) ELSE NULLIF(name_de, '') END AS "name_de",
+                slice_language_tags(tags) || hstore(ARRAY ['name', name, 'name:en', name_en, 'name:de', name_de]) AS tags,
+                NULL AS ref,
+                'shipway' AS highway,
+                shipway AS subclass,
+                NULL AS brunnel,
+                NULL::int AS level,
+                layer,
+                NULL AS indoor,
+                NULL AS network_type,
+                NULL AS route_1,
+                NULL AS route_2,
+                NULL AS route_3,
+                NULL AS route_4,
+                NULL AS route_5,
+                NULL AS route_6,
+                min(z_order) AS z_order
+         FROM osm_shipway_linestring
+         WHERE name <> ''
+         GROUP BY name, name_en, name_de, tags, subclass, "level", layer
      ) AS highway_union
 ;
 CREATE INDEX IF NOT EXISTS osm_transportation_name_linestring_name_ref_idx ON osm_transportation_name_linestring (coalesce(name, ''), coalesce(ref, ''));