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=919065.72..919066.22 rows=200 width=8) (actual time=66753.099..66753.103 rows=46 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=257235 read=31821 written=64
   ->  HashAggregate  (cost=919056.08..919058.08 rows=200 width=8) (actual time=66752.989..66752.992 rows=46 loops=1)
         Buffers: shared hit=257232 read=31821 written=64
         ->  HashAggregate  (cost=881556.08..896556.08 rows=1500000 width=8) (actual time=65567.627..66428.056 rows=1500000 loops=1)
               Buffers: shared hit=257232 read=31821 written=64
               ->  Hash Right Join  (cost=69028.00..807380.38 rows=14835139 width=8) (actual time=2069.998..47120.947 rows=15353060 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=257232 read=31821 written=64
                     ->  Seq Scan on orders  (cost=0.00..441649.60 rows=14835139 width=8) (actual time=0.038..9207.726 rows=14853044 loops=1)
                           Filter: ((o_comment)::text !~~ '%pending%accounts%'::text)
                           Rows Removed by Filter: 161956
                           Buffers: shared hit=232274 read=21501
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=2067.793..2067.793 rows=1500000 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 52735kB
                           Buffers: shared hit=24958 read=10320 written=64
                           ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=4) (actual time=0.008..759.337 rows=1500000 loops=1)
                                 Buffers: shared hit=24958 read=10320 written=64
 Total runtime: 66817.460 ms
(21 rows)

COMMIT;
COMMIT