Add citus_nodes view

src/backend/distributed/sql/citus--13.0-1--13.1-1.sql

@@ -50,3 +50,4 @@ DROP VIEW IF EXISTS pg_catalog.citus_lock_waits;
 #include "udfs/citus_is_primary_node/13.1-1.sql"
 #include "udfs/citus_stat_counters/13.1-1.sql"
 #include "udfs/citus_stat_counters_reset/13.1-1.sql"
+#include "udfs/citus_nodes/13.1-1.sql"

src/backend/distributed/sql/udfs/citus_nodes/13.1-1.sql

@@ -0,0 +1,18 @@
+SET search_path = 'pg_catalog';
+DROP VIEW IF EXISTS pg_catalog.citus_nodes;
+
+CREATE OR REPLACE VIEW citus.citus_nodes AS
+SELECT 
+    nodename, 
+    nodeport, 
+    CASE 
+        WHEN groupid = 0 THEN 'coordinator'
+        ELSE 'worker'
+    END AS role, 
+    isactive AS active 
+FROM pg_dist_node;
+
+ALTER VIEW citus.citus_nodes SET SCHEMA pg_catalog;
+GRANT SELECT ON pg_catalog.citus_nodes TO PUBLIC;
+
+RESET search_path;

src/backend/distributed/sql/udfs/citus_nodes/latest.sql

@@ -0,0 +1,18 @@
+SET search_path = 'pg_catalog';
+DROP VIEW IF EXISTS pg_catalog.citus_nodes;
+
+CREATE OR REPLACE VIEW citus.citus_nodes AS
+SELECT 
+    nodename, 
+    nodeport, 
+    CASE 
+        WHEN groupid = 0 THEN 'coordinator'
+        ELSE 'worker'
+    END AS role, 
+    isactive AS active 
+FROM pg_dist_node;
+
+ALTER VIEW citus.citus_nodes SET SCHEMA pg_catalog;
+GRANT SELECT ON pg_catalog.citus_nodes TO PUBLIC;
+
+RESET search_path;