BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	c_count,
	count(*) as custdist
from
	(
		select
			c_custkey,
			count(o_orderkey)
		from
			customer left outer join orders on
				c_custkey = o_custkey
				and o_comment not like '%pending%accounts%'
		group by
			c_custkey
	) as c_orders (c_custkey, c_count)
group by
	c_count
order by
	custdist desc,
	c_count desc;
                                                                    QUERY PLAN                                                                    
--------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=927986.48..927986.98 rows=200 width=8) (actual time=65898.275..65898.277 rows=46 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=277758 read=14083 written=286
   ->  HashAggregate  (cost=927976.84..927978.84 rows=200 width=8) (actual time=65898.167..65898.177 rows=46 loops=1)
         Buffers: shared hit=277755 read=14083 written=286
         ->  HashAggregate  (cost=890476.84..905476.84 rows=1500000 width=8) (actual time=64710.859..65525.554 rows=1500000 loops=1)
               Buffers: shared hit=277755 read=14083 written=286
               ->  Hash Right Join  (cost=69028.00..815486.35 rows=14998098 width=8) (actual time=1402.970..46811.704 rows=15353138 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=277755 read=14083 written=286
                     ->  Seq Scan on orders  (cost=0.00..446496.39 rows=14998098 width=8) (actual time=0.058..10815.082 rows=14853122 loops=1)
                           Filter: ((o_comment)::text !~~ '%pending%accounts%'::text)
                           Rows Removed by Filter: 161878
                           Buffers: shared hit=242477 read=14083 written=286
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=1401.243..1401.243 rows=1500000 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 52735kB
                           Buffers: shared hit=35278
                           ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=4) (actual time=0.012..748.029 rows=1500000 loops=1)
                                 Buffers: shared hit=35278
 Total runtime: 65923.769 ms
(21 rows)

COMMIT;
COMMIT