add etldoc to layer_water_name

gen_etl_graph_water_name.sh

@@ -0,0 +1,20 @@
+
+
+ID=water_name
+DOT=${ID}.dot
+
+echo "digraph G
+{    
+rankdir=LR;
+" > $DOT
+
+cat ./layers/${ID}/merge_lakelines.sql  | grep "\-\- etldoc:" |  sed 's/-- etldoc://g' >>$DOT
+cat ./layers/${ID}/layer.sql            | grep "\-\- etldoc:" |  sed 's/-- etldoc://g' >>$DOT
+
+echo "
+}
+" >> $DOT
+
+cat $DOT
+
+dot -Tpng $DOT > layer_${ID}_etl.png

layers/water_name/layer.sql

@@ -1,5 +1,11 @@
+
+-- etldoc: layer_water_name[shape=record fillcolor=lightpink, style="rounded,filled",  
+-- etldoc:     label="layer_water_name | <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, class text) AS $$
+    -- etldoc: osm_water_lakeline ->  layer_water_name:z9_13
+    -- etldoc: osm_water_lakeline ->  layer_water_name:z14_    
     SELECT osm_id, geometry, name, name_en, 'lake'::text AS class
     FROM osm_water_lakeline
     WHERE geometry && bbox

layers/water_name/merge_lakelines.sql

@@ -1,3 +1,5 @@
+
+-- etldoc:  osm_water_polygon ->  osm_water_lakeline
 CREATE TABLE IF NOT EXISTS osm_water_lakeline AS (
 	SELECT wp.osm_id,
 		ll.wkb_geometry AS geometry,