-node_nodenetworks.nodenetwork_ids,
-node_nodegroups.nodegroup_ids,
-node_slices.slice_ids,
-node_pcus.pcu_ids,
-node_pcus.ports,
-node_conf_files.conf_file_ids,
-node_session.session_id AS session,
-nodes.deleted
+COALESCE(node_nodenetworks.nodenetwork_ids, '{}') AS nodenetwork_ids,
+COALESCE(node_nodegroups.nodegroup_ids, '{}') AS nodegroup_ids,
+COALESCE(node_slices.slice_ids, '{}') AS slice_ids,
+COALESCE(node_pcus.pcu_ids, '{}') AS pcu_ids,
+COALESCE(node_pcus.ports, '{}') AS ports,
+COALESCE(node_conf_files.conf_file_ids, '{}') AS conf_file_ids,
+node_session.session_id AS session