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=928746.23..928746.73 rows=200 width=8) (actual time=59569.456..59569.459 rows=46 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=194593 read=97248 written=4
   ->  HashAggregate  (cost=928736.59..928738.59 rows=200 width=8) (actual time=59569.345..59569.357 rows=46 loops=1)
         Buffers: shared hit=194590 read=97248 written=4
         ->  HashAggregate  (cost=891236.59..906236.59 rows=1500000 width=8) (actual time=58394.115..59243.838 rows=1500000 loops=1)
               Buffers: shared hit=194590 read=97248 written=4
               ->  Hash Right Join  (cost=69028.00..816094.15 rows=15028488 width=8) (actual time=1333.176..42624.507 rows=15338126 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=194590 read=97248 written=4
                     ->  Seq Scan on orders  (cost=0.00..446496.39 rows=15028488 width=8) (actual time=0.036..9415.217 rows=14838105 loops=1)
                           Filter: ((o_comment)::text !~~ '%pending%deposits%'::text)
                           Rows Removed by Filter: 161895
                           Buffers: shared hit=194588 read=61972 written=4
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=1331.209..1331.209 rows=1500000 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 52735kB
                           Buffers: shared hit=2 read=35276
                           ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=4) (actual time=0.010..791.752 rows=1500000 loops=1)
                                 Buffers: shared hit=2 read=35276
 Total runtime: 59596.875 ms
(21 rows)

COMMIT;
COMMIT