-- Tests functions related to cluster membership
-- add the nodes to the cluster
SELECT master_add_node('localhost', :worker_2_port);
    master_add_node    
-----------------------
 (1,1,localhost,57638)
(1 row)

SELECT master_add_node('localhost', :worker_1_port);
    master_add_node    
-----------------------
 (2,2,localhost,57637)
(1 row)

-- get the active nodes
SELECT master_get_active_worker_nodes();
 master_get_active_worker_nodes 
--------------------------------
 (localhost,57638)
 (localhost,57637)
(2 rows)

-- try to add the node again when it is activated
SELECT master_add_node('localhost', :worker_1_port);
    master_add_node    
-----------------------
 (2,2,localhost,57637)
(1 row)

-- get the active nodes
SELECT master_get_active_worker_nodes();
 master_get_active_worker_nodes 
--------------------------------
 (localhost,57638)
 (localhost,57637)
(2 rows)