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=917196.99..917197.49 rows=200 width=8) (actual time=82200.482..82200.483 rows=46 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=240599 read=48457 written=133
   ->  HashAggregate  (cost=917187.35..917189.35 rows=200 width=8) (actual time=82200.364..82200.376 rows=46 loops=1)
         Buffers: shared hit=240596 read=48457 written=133
         ->  HashAggregate  (cost=879687.35..894687.35 rows=1500000 width=8) (actual time=80994.148..81844.755 rows=1500000 loops=1)
               Buffers: shared hit=240596 read=48457 written=133
               ->  Hash Right Join  (cost=69028.00..805885.40 rows=14760390 width=8) (actual time=2329.999..57575.589 rows=15353001 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=240596 read=48457 written=133
                     ->  Seq Scan on orders  (cost=0.00..441649.60 rows=14760390 width=8) (actual time=0.039..13408.760 rows=14852980 loops=1)
                           Filter: ((o_comment)::text !~~ '%pending%deposits%'::text)
                           Rows Removed by Filter: 162020
                           Buffers: shared hit=240593 read=13182 written=133
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=2328.256..2328.256 rows=1500000 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 52735kB
                           Buffers: shared hit=3 read=35275
                           ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=4) (actual time=0.009..1456.871 rows=1500000 loops=1)
                                 Buffers: shared hit=3 read=35275
 Total runtime: 82257.895 ms
(21 rows)

COMMIT;
COMMIT