-- Add to the search path the schema
SET search_path TO public,cartodb,cdb_dataservices_client;
CREATE TABLE my_table(cartodb_id int);
INSERT INTO my_table (cartodb_id) VALUES (1);
-- Mock the server functions
CREATE OR REPLACE FUNCTION cdb_dataservices_server._OBS_ConnectUserTable(username text, orgname text, user_db_role text, input_schema text, dbname text, table_name text)
RETURNS cdb_dataservices_client.ds_fdw_metadata AS $$
BEGIN
  RETURN ('dummy_schema'::text, 'dummy_table'::text, 'dummy_server'::text);
END;
$$ LANGUAGE 'plpgsql';
CREATE OR REPLACE FUNCTION cdb_dataservices_server._OBS_GetReturnMetadata(username text, orgname text, function_name text, params json)
RETURNS cdb_dataservices_client.ds_return_metadata AS $$
BEGIN
  RETURN (Array['total_pop'], Array['double precision']);
END;
$$ LANGUAGE 'plpgsql';
CREATE OR REPLACE FUNCTION cdb_dataservices_server._OBS_FetchJoinFdwTableData(username text, orgname text, table_schema text, table_name text, function_name text, params json)
RETURNS RECORD AS $$
BEGIN
  RETURN (23.4::double precision, 1::int);
END;
$$ LANGUAGE 'plpgsql';
CREATE OR REPLACE FUNCTION cdb_dataservices_server._OBS_DisconnectUserTable(username text, orgname text, table_schema text, table_name text, servername text)
RETURNS boolean AS $$
BEGIN
  RETURN true;
END;
$$ LANGUAGE 'plpgsql';
-- Augment a table with the total_pop column
SELECT cdb_dataservices_client._OBS_AugmentTable('my_table', 'dummy', '{"dummy":"dummy"}'::json);
 _obs_augmenttable 
-------------------
 t
(1 row)

-- The results of the table should return the mocked value of 23.4 in the total_pop column
SELECT * FROM my_table;
 cartodb_id | total_pop 
------------+-----------
          1 |      23.4
(1 row)

-- Mock again the function for it to return a different value now
CREATE OR REPLACE FUNCTION cdb_dataservices_server._OBS_FetchJoinFdwTableData(username text, orgname text, table_schema text, table_name text, function_name text, params json)
RETURNS RECORD AS $$
BEGIN
  RETURN (577777.4::double precision, 1::int);
END;
$$ LANGUAGE 'plpgsql';
-- Augment a new table with total_pop
SELECT cdb_dataservices_client._OBS_GetTable('my_table', 'my_table_new', 'dummy', '{"dummy":"dummy"}'::json);
 _obs_gettable 
---------------
 t
(1 row)

-- Check that the table contains the new value for total_pop and not the value already existent in the table
SELECT * FROM my_table_new;
 total_pop | cartodb_id 
-----------+------------
  577777.4 |          1
(1 row)

-- Clean tables
DROP TABLE my_table;
DROP TABLE my_table_new;