finalizes test query

src/pg/test/sql/11_kmeans_test.sql

@@ -20,12 +20,15 @@ FROM (
 
 -- nonspatial kmeans
 SELECT
-    cluster_label,
-    cluster_center,
+    cluster_label::int in (0, 1) As cluster_label,
+    cluster_center::json->>'col1' As cc_col1,
+    cluster_center::json->>'col2' As cc_col2,
     silhouettes,
     inertia,
     rowid
 FROM cdb_crankshaft.CDB_KMeansNonspatial(
-    'SELECT unnest(Array[1, 1, 10, 10]) As col1, unnest(Array[100, 100, 2, 2]) As col2 FROM ppoints',
+    'SELECT unnest(Array[1, 1, 10, 10]) As col1, ' ||
+    'unnest(Array[100, 100, 2, 2]) As col2, ' ||
+    'unnest(Array[1, 2, 3, 4]) As cartodb_id ',
     Array['col1', 'col2']::text[],
     2);