src/test/regress/expected/enable_autovacuum.out

alter system set autovacuum = on;
select gp_segment_id, pg_reload_conf() from gp_id union select gp_segment_id, pg_reload_conf() from gp_dist_random('gp_id');
 gp_segment_id | pg_reload_conf 
---------------+----------------
             2 | t
             1 | t
             0 | t
            -1 | t
(4 rows)