SELECT column_name FROM information_schema.columns WHERE table_name = 'citus_stat_activity' AND column_name NOT IN ('leader_pid', 'query_id')
EXCEPT SELECT column_name FROM information_schema.columns WHERE table_name = 'pg_stat_activity'
ORDER BY 1;

SELECT column_name FROM information_schema.columns WHERE table_name = 'pg_stat_activity'
EXCEPT SELECT column_name FROM information_schema.columns WHERE table_name = 'citus_stat_activity'
ORDER BY 1;