Rename generic layer.sql to actual_layer_name .sql (#1034)

Following layers had generic `layer.sql` name.

- `aerodrome_label`
- `aeroway`
- `housenumber`
- `mountain_peak`
- `park`
- `place`
- `poi`
- `transportation`
- `transportation_name`
- `water_name`

This PR renames `layer.sql` to `aerodrome_label.sql`, `aeroway.sql`...

layers/water_name/water_name.sql

@@ -0,0 +1,79 @@
+-- etldoc: layer_water_name[shape=record fillcolor=lightpink, style="rounded,filled",
+-- etldoc:     label="layer_water_name | <z0_8> z0_8 | <z9_13> z9_13 | <z14_> z14+" ] ;
+
+CREATE OR REPLACE FUNCTION layer_water_name(bbox geometry, zoom_level integer)
+    RETURNS TABLE
+            (
+                osm_id       bigint,
+                geometry     geometry,
+                name         text,
+                name_en      text,
+                name_de      text,
+                tags         hstore,
+                class        text,
+                intermittent int
+            )
+AS
+$$
+SELECT
+    -- etldoc: osm_water_lakeline ->  layer_water_name:z9_13
+    -- etldoc: osm_water_lakeline ->  layer_water_name:z14_
+    CASE
+        WHEN osm_id < 0 THEN -osm_id * 10 + 4
+        ELSE osm_id * 10 + 1
+        END AS osm_id_hash,
+    geometry,
+    name,
+    COALESCE(NULLIF(name_en, ''), name) AS name_en,
+    COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
+    tags,
+    'lake'::text AS class,
+    is_intermittent::int AS intermittent
+FROM osm_water_lakeline
+WHERE geometry && bbox
+  AND ((zoom_level BETWEEN 9 AND 13 AND LineLabel(zoom_level, NULLIF(name, ''), geometry))
+    OR (zoom_level >= 14))
+UNION ALL
+SELECT
+    -- etldoc: osm_water_point ->  layer_water_name:z9_13
+    -- etldoc: osm_water_point ->  layer_water_name:z14_
+    CASE
+        WHEN osm_id < 0 THEN -osm_id * 10 + 4
+        ELSE osm_id * 10 + 1
+        END AS osm_id_hash,
+    geometry,
+    name,
+    COALESCE(NULLIF(name_en, ''), name) AS name_en,
+    COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
+    tags,
+    'lake'::text AS class,
+    is_intermittent::int AS intermittent
+FROM osm_water_point
+WHERE geometry && bbox
+  AND (
+        (zoom_level BETWEEN 9 AND 13 AND area > 70000 * 2 ^ (20 - zoom_level))
+        OR (zoom_level >= 14)
+    )
+UNION ALL
+SELECT
+    -- etldoc: osm_marine_point ->  layer_water_name:z0_8
+    -- etldoc: osm_marine_point ->  layer_water_name:z9_13
+    -- etldoc: osm_marine_point ->  layer_water_name:z14_
+    osm_id * 10 AS osm_id_hash,
+    geometry,
+    name,
+    COALESCE(NULLIF(name_en, ''), name) AS name_en,
+    COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
+    tags,
+    place::text AS class,
+    is_intermittent::int AS intermittent
+FROM osm_marine_point
+WHERE geometry && bbox
+  AND (
+        place = 'ocean'
+        OR (zoom_level >= "rank" AND "rank" IS NOT NULL)
+        OR (zoom_level >= 8)
+    );
+$$ LANGUAGE SQL STABLE
+                -- STRICT
+                PARALLEL SAFE;