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=926801.21..926801.71 rows=200 width=8) (actual time=63003.868..63003.871 rows=46 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=249838 read=41750 written=84
   ->  HashAggregate  (cost=926791.56..926793.56 rows=200 width=8) (actual time=63003.729..63003.738 rows=46 loops=1)
         Buffers: shared hit=249835 read=41750 written=84
         ->  HashAggregate  (cost=889291.56..904291.56 rows=1500000 width=8) (actual time=61902.884..62673.587 rows=1500000 loops=1)
               Buffers: shared hit=249835 read=41750 written=84
               ->  Hash Right Join  (cost=69028.00..814450.07 rows=14968299 width=8) (actual time=2162.554..45368.317 rows=15352954 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=249835 read=41750 written=84
                     ->  Seq Scan on orders  (cost=0.00..446056.09 rows=14968299 width=8) (actual time=0.040..10243.893 rows=14852933 loops=1)
                           Filter: ((o_comment)::text !~~ '%pending%deposits%'::text)
                           Rows Removed by Filter: 162067
                           Buffers: shared hit=249833 read=6474 written=57
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=2159.906..2159.906 rows=1500000 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 52735kB
                           Buffers: shared hit=2 read=35276 written=27
                           ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=4) (actual time=0.026..1369.862 rows=1500000 loops=1)
                                 Buffers: shared hit=2 read=35276 written=27
 Total runtime: 63031.378 ms
(21 rows)

COMMIT;
COMMIT