Move aboriginal lands boundaries to boundary layer (#1604)

This PR adds indigenous lands to the `boundary` layer by adding new area features for these objects, along with generalization up to z4. It borrows heavily from the technical processing chain of the `park` layer.

I added new `class`, `name`, and `name:xx` attributes to the boundary layer, in order to support the new area features. Should we (or someone extending this schema) come up with new objects to place in the boundary layer in the future, `class` would support additional categories.

layers/boundary/boundary.sql

@@ -632,7 +632,7 @@ FROM osm_border_linestring_gen_z13
     );
 
 -- etldoc: layer_boundary[shape=record fillcolor=lightpink, style="rounded,filled",
--- etldoc:     label="<sql> layer_boundary |<z0> z0 |<z1> z1 |<z2> z2 | <z3> z3 | <z4> z4 | <z5> z5 | <z6> z6 | <z7> z7 | <z8> z8 | <z9> z9 |<z10> z10 |<z11> z11 |<z12> z12|<z13> z13+"]
+-- etldoc:     label="<sql> layer_boundary |<z0> z0 |<z1> z1 |<z2> z2 | <z3> z3 | <z4> z4 | <z5> z5 | <z6> z6 | <z7> z7 | <z8> z8 | <z9> z9 |<z10> z10 |<z11> z11 |<z12> z12|<z13> z13|<z14> z14+"]
 CREATE OR REPLACE FUNCTION layer_boundary(bbox geometry, zoom_level int)
     RETURNS TABLE
             (
@@ -643,11 +643,14 @@ CREATE OR REPLACE FUNCTION layer_boundary(bbox geometry, zoom_level int)
                 disputed      int,
                 disputed_name text,
                 claimed_by    text,
-                maritime      int
+                maritime      int,
+                class         text,
+                name          text,
+                tags          hstore
             )
 AS
 $$
-SELECT geometry, admin_level, adm0_l, adm0_r, disputed::int, disputed_name, claimed_by, maritime::int
+SELECT geometry, admin_level, adm0_l, adm0_r, disputed::int, disputed_name, claimed_by, maritime::int, NULL::text, NULL::text, NULL::hstore
 FROM (
          -- etldoc: boundary_z0 ->  layer_boundary:z0
          SELECT *
@@ -732,7 +735,134 @@ FROM (
          FROM boundary_z13
          WHERE geometry && bbox
            AND zoom_level >= 13
-     ) AS zoom_levels;
+     ) AS segment_zoom_levels
+
+UNION ALL
+
+SELECT geometry, NULL::int, NULL::text, NULL::text, NULL::int, NULL::text, NULL::text, NULL::int, class, name, tags
+FROM (
+
+         -- etldoc: osm_boundary_polygon_gen_z4 -> layer_boundary:z4
+         SELECT geometry,
+                boundary AS class,
+                name,
+                tags
+         FROM osm_boundary_polygon_gen_z4
+         WHERE zoom_level = 4
+         AND geometry && bbox
+
+         UNION ALL
+
+         -- etldoc: osm_boundary_polygon_gen_z5 -> layer_boundary:z5
+         SELECT geometry,
+                boundary AS class,
+                name,
+                tags
+         FROM osm_boundary_polygon_gen_z5
+         WHERE zoom_level = 5
+         AND geometry && bbox
+
+         UNION ALL
+
+         -- etldoc: osm_boundary_polygon_gen_z6 -> layer_boundary:z6
+         SELECT geometry,
+                boundary AS class,
+                name,
+                tags
+         FROM osm_boundary_polygon_gen_z6
+         WHERE zoom_level = 6
+         AND geometry && bbox
+
+         UNION ALL
+
+         -- etldoc: osm_boundary_polygon_gen_z7 -> layer_boundary:z7
+         SELECT geometry,
+                boundary AS class,
+                name,
+                tags
+         FROM osm_boundary_polygon_gen_z7
+         WHERE zoom_level = 7
+         AND geometry && bbox
+
+         UNION ALL
+
+         -- etldoc: osm_boundary_polygon_gen_z8 -> layer_boundary:z8
+         SELECT geometry,
+                boundary AS class,
+                name,
+                tags
+         FROM osm_boundary_polygon_gen_z8
+         WHERE zoom_level = 8
+         AND geometry && bbox
+
+         UNION ALL
+
+         -- etldoc: osm_boundary_polygon_gen_z9 -> layer_boundary:z9
+         SELECT geometry,
+                boundary AS class,
+                name,
+                tags
+         FROM osm_boundary_polygon_gen_z9
+         WHERE zoom_level = 9
+         AND geometry && bbox
+
+         UNION ALL
+
+         -- etldoc: osm_boundary_polygon_gen_z10 -> layer_boundary:z10
+         SELECT geometry,
+                boundary AS class,
+                name,
+                tags
+         FROM osm_boundary_polygon_gen_z10
+         WHERE zoom_level = 10
+         AND geometry && bbox
+
+         UNION ALL
+
+         -- etldoc: osm_boundary_polygon_gen_z11 -> layer_boundary:z11
+         SELECT geometry,
+                boundary AS class,
+                name,
+                tags
+         FROM osm_boundary_polygon_gen_z11
+         WHERE zoom_level = 11
+         AND geometry && bbox
+
+         UNION ALL
+
+         -- etldoc: osm_boundary_polygon_gen_z12 -> layer_boundary:z12
+         SELECT geometry,
+                boundary AS class,
+                name,
+                tags
+         FROM osm_boundary_polygon_gen_z12
+         WHERE zoom_level = 12
+         AND geometry && bbox
+
+         UNION ALL
+
+         -- etldoc: osm_boundary_polygon_gen_z13 -> layer_boundary:z13
+         SELECT geometry,
+                boundary AS class,
+                name,
+                tags
+         FROM osm_boundary_polygon_gen_z13
+         WHERE zoom_level = 13
+         AND geometry && bbox
+
+         UNION ALL
+
+         -- etldoc: osm_boundary_polygon -> layer_boundary:z14
+         SELECT geometry,
+                boundary AS class,
+                name,
+                tags
+         FROM osm_boundary_polygon
+         WHERE zoom_level = 14
+         AND geometry && bbox
+
+     ) AS area_zoom_levels
+
 $$ LANGUAGE SQL STABLE
                 -- STRICT
                 PARALLEL SAFE;