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=922305.89..922306.39 rows=200 width=8) (actual time=58044.353..58044.358 rows=46 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=290049 read=19
   ->  HashAggregate  (cost=922296.25..922298.25 rows=200 width=8) (actual time=58044.238..58044.252 rows=46 loops=1)
         Buffers: shared hit=290046 read=19
         ->  HashAggregate  (cost=884796.25..899796.25 rows=1500000 width=8) (actual time=56800.629..57707.610 rows=1500000 loops=1)
               Buffers: shared hit=290046 read=19
               ->  Hash Right Join  (cost=69028.00..810324.76 rows=14894298 width=8) (actual time=1021.042..40379.347 rows=15338258 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=290046 read=19
                     ->  Seq Scan on orders  (cost=0.00..443410.80 rows=14894298 width=8) (actual time=0.043..9324.511 rows=14838242 loops=1)
                           Filter: ((o_comment)::text !~~ '%pending%accounts%'::text)
                           Rows Removed by Filter: 161758
                           Buffers: shared hit=254768 read=19
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=1019.038..1019.038 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=0.023..592.946 rows=1500000 loops=1)
                                 Buffers: shared hit=35278
 Total runtime: 58080.002 ms
(21 rows)

COMMIT;
COMMIT