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=924738.26..924738.76 rows=200 width=8) (actual time=65919.135..65919.138 rows=46 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=288943 read=1886
   ->  HashAggregate  (cost=924728.61..924730.61 rows=200 width=8) (actual time=65919.009..65919.020 rows=46 loops=1)
         Buffers: shared hit=288940 read=1886
         ->  HashAggregate  (cost=887228.61..902228.61 rows=1500000 width=8) (actual time=64770.313..65581.263 rows=1500000 loops=1)
               Buffers: shared hit=288940 read=1886
               ->  Hash Right Join  (cost=69028.00..812535.53 rows=14938617 width=8) (actual time=1919.185..46807.848 rows=15353086 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=288940 read=1886
                     ->  Seq Scan on orders  (cost=0.00..444735.19 rows=14938617 width=8) (actual time=0.062..11009.500 rows=14853070 loops=1)
                           Filter: ((o_comment)::text !~~ '%pending%accounts%'::text)
                           Rows Removed by Filter: 161930
                           Buffers: shared hit=253662 read=1886
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=1917.059..1917.059 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=0.013..1114.667 rows=1500000 loops=1)
                                 Buffers: shared hit=35278
 Total runtime: 65950.622 ms
(21 rows)

COMMIT;
COMMIT