Add overview tests

test/CDB_OverviewsTest.sql

@@ -0,0 +1,19 @@
+SET client_min_messages TO error;
+\set VERBOSITY default
+
+\i test/overviews/fixtures.sql
+
+SELECT _CDB_Aggregable_Attributes_Expression('base_bare_t'::regclass);
+SELECT _CDB_Aggregated_Attributes_Expression('base_bare_t'::regclass);
+SELECT _CDB_Aggregated_Attributes_Expression('base_bare_t'::regclass, 'tab');
+
+SELECT CDB_CreateOverviews('base_bare_t'::regclass);
+
+SELECT _CDB_Aggregable_Attributes_Expression('base_t'::regclass);
+SELECT _CDB_Aggregated_Attributes_Expression('base_t'::regclass);
+SELECT _CDB_Aggregated_Attributes_Expression('base_t'::regclass, 'tab');
+
+SELECT CDB_CreateOverviews('base_t'::regclass);
+
+DROP TABLE base_bare_t;
+DROP TABLE base_t;

test/CDB_OverviewsTest_expect

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+SET
+CREATE TABLE
+INSERT 0 1114
+CREATE TABLE
+INSERT 0 1114
+
+
+
+{base_bare_t_ov5,base_bare_t_ov3,base_bare_t_ov1}
+number,int_number,name,start
+AVG(number)::double precision AS number,AVG(int_number)::integer AS int_number,''::text AS name,NULL::date AS start
+AVG(tab.number)::double precision AS number,AVG(tab.int_number)::integer AS int_number,''::text AS name,NULL::date AS start
+{base_t_ov5,base_t_ov3,base_t_ov1}
+DROP TABLE
+DROP TABLE

test/overviews/gen_points.rb

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+# Ruby script to generate test/overviews/fixtures.sql for testing overviews
+# Generated tables:
+# * base_bare_t -- points without attributes (only PK, geometries)
+
+NUM_CLUSTERS = 128
+MAX_PER_CLUSTER = 16
+CLUSTER_RADIUS = 1E-3
+MIN_X = -10.0
+MAX_X =  10.0
+MIN_Y =  30.0
+MAX_Y = 40.0
+ATTRIBUTES = "number double precision, int_number integer, name text, start date"
+
+id = 0
+POINTS = (0...NUM_CLUSTERS).map{
+  x = MIN_X + rand()*(MAX_X - MIN_X)
+  y = MIN_Y + rand()*(MAX_Y - MIN_Y)
+  (0..rand(MAX_PER_CLUSTER)).map{
+    id += 1
+    {
+      id: id,
+      x: (x + rand()*CLUSTER_RADIUS).round(6),
+      y: (y + rand()*CLUSTER_RADIUS).round(6)
+    }
+  }
+}.flatten
+
+values = POINTS.map{ |point|
+  "#{point[:id]}, 'SRID=4326;POINT(#{point[:x]} #{point[:y]})'::geometry, ST_Transform('SRID=4326;POINT(#{point[:x]} #{point[:y]})'::geometry, 3857)"
+}
+
+File.open('fixtures.sql', 'w') do |sql|
+
+  sql.puts "-- bare table with no attribute columns"
+  sql.puts "CREATE TABLE base_bare_t (cartodb_id integer, the_geom geometry, the_geom_webmercator geometry);"
+  sql.puts "INSERT INTO base_bare_t VALUES"
+  sql.puts values.map{|v| "(#{v})"}.join(",\n") + ";"
+
+  sql.puts "-- table with attributes"
+  sql.puts "CREATE TABLE base_t (cartodb_id integer, the_geom geometry, the_geom_webmercator geometry, #{ATTRIBUTES});"
+  sql.puts "INSERT INTO base_t VALUES"
+  sql.puts values.map{|v| "(#{v})"}.join(",\n") + ";"
+end