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%deposits%'
		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=929928.61..929929.11 rows=200 width=8) (actual time=95578.856..95578.860 rows=45 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=236721 read=55373 written=6
   ->  HashAggregate  (cost=929918.96..929920.96 rows=200 width=8) (actual time=95578.741..95578.752 rows=45 loops=1)
         Buffers: shared hit=236718 read=55373 written=6
         ->  HashAggregate  (cost=892418.96..907418.96 rows=1500000 width=8) (actual time=94199.159..95217.379 rows=1500000 loops=1)
               Buffers: shared hit=236718 read=55373 written=6
               ->  Hash Right Join  (cost=69028.00..817128.11 rows=15058171 width=8) (actual time=4350.242..67984.493 rows=15352974 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=236718 read=55373 written=6
                     ->  Seq Scan on orders  (cost=0.00..446936.69 rows=15058171 width=8) (actual time=0.050..19092.548 rows=14852953 loops=1)
                           Filter: ((o_comment)::text !~~ '%pending%deposits%'::text)
                           Rows Removed by Filter: 162047
                           Buffers: shared hit=236715 read=20098
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=4348.434..4348.434 rows=1500000 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 52735kB
                           Buffers: shared hit=3 read=35275 written=6
                           ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=4) (actual time=0.012..3484.101 rows=1500000 loops=1)
                                 Buffers: shared hit=3 read=35275 written=6
 Total runtime: 95630.525 ms
(21 rows)

COMMIT;
COMMIT