Adds fake CDB_KMeans function

test/support/sql/windshaft.test.sql

@@ -633,3 +633,18 @@ GRANT SELECT ON TABLE analysis_rent_listings TO :PUBLICUSER;
 
 --
 GRANT SELECT, UPDATE, INSERT, DELETE ON cdb_analysis_catalog TO :TESTUSER;
+
+create schema cdb_crankshaft;
+GRANT USAGE ON SCHEMA cdb_crankshaft TO :TESTUSER;
+CREATE TYPE kmeans_type as (cartodb_id numeric, cluster_no numeric);
+CREATE OR REPLACE FUNCTION cdb_crankshaft.CDB_KMeans(query text, no_clusters integer,no_init integer default 20)
+    RETURNS setof kmeans_type as $$
+    DECLARE r kmeans_type;
+    BEGIN
+    FOR r IN EXECUTE format('select cartodb_id, ceil(random() * 10) AS cluster_no from (%s) _cdb_query', query) loop
+        RETURN NEXT r;
+    END LOOP;
+    RETURN;
+    END;
+$$ LANGUAGE plpgsql;
+GRANT ALL ON FUNCTION cdb_crankshaft.CDB_KMeans(text, integer, integer) TO :TESTUSER;