QUERY PLAN                               
-----------------------------------------------------------------------
 GroupAggregate  (cost=33.56..40.39 rows=4 width=9)
   Group Key: pg_class.relkind
   ->  Sort  (cost=33.56..34.53 rows=388 width=1)
         Sort Key: pg_class.relkind
         ->  Seq Scan on pg_class  (cost=0.00..16.88 rows=388 width=1)
(5 rows)