Avoid outputting python error messages in regress tests

test/CDB_GhostTables.sql

@@ -1,6 +1,56 @@
 -- Create user and enable Ghost tables trigger
 \set QUIET on
 SET client_min_messages TO error;
+
+-- Recreate the function without extra error messages as it changes depending on the python-redis version
+CREATE OR REPLACE FUNCTION cartodb._CDB_LinkGhostTables(username text, db_name text, event_name text)
+RETURNS void
+AS $$
+  if not username:
+    return
+
+  if 'json' not in GD:
+    import json
+    GD['json'] = json
+  else:
+    json = GD['json']
+
+  tis_config = plpy.execute("select cartodb.CDB_Conf_GetConf('invalidation_service');")[0]['cdb_conf_getconf']
+  if not tis_config:
+    plpy.warning('Invalidation service configuration not found. Skipping Ghost Tables linking.')
+    return
+
+  tis_config_dict = json.loads(tis_config)
+  tis_host = tis_config_dict.get('host')
+  tis_port = tis_config_dict.get('port')
+  tis_timeout = tis_config_dict.get('timeout', 5)
+  tis_retry = tis_config_dict.get('retry', 5)
+
+  client = GD.get('invalidation', None)
+
+  while True:
+
+    if not client:
+        try:
+          import redis
+          client = redis.Redis(host=tis_host, port=tis_port, socket_timeout=tis_timeout)
+          GD['invalidation'] = client
+        except Exception as err:
+          # NOTE: no retries on connection error
+          plpy.warning('Error trying to connect to Invalidation Service to link Ghost Tables')
+          break
+
+    try:
+      client.execute_command('DBSCH', db_name, username, event_name)
+      break
+    except Exception as err:
+      client = GD['invalidation'] = None # force reconnect
+      if not tis_retry:
+        plpy.warning('Error calling Invalidation Service to link Ghost Tables')
+        break
+      tis_retry -= 1 # try reconnecting
+$$ LANGUAGE '@@plpythonu@@' VOLATILE PARALLEL UNSAFE;
+
 SELECT CDB_EnableGhostTablesTrigger();
 CREATE ROLE "fulano" LOGIN;
 GRANT ALL ON SCHEMA cartodb TO "fulano";