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=929117.43..929117.93 rows=200 width=8) (actual time=87473.750..87473.754 rows=46 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=252323 read=39518 dirtied=253 written=11
   ->  HashAggregate  (cost=929107.79..929109.79 rows=200 width=8) (actual time=87473.644..87473.658 rows=46 loops=1)
         Buffers: shared hit=252320 read=39518 dirtied=253 written=11
         ->  HashAggregate  (cost=891607.79..906607.79 rows=1500000 width=8) (actual time=86061.083..87106.753 rows=1500000 loops=1)
               Buffers: shared hit=252320 read=39518 dirtied=253 written=11
               ->  Hash Right Join  (cost=69028.00..816391.11 rows=15043336 width=8) (actual time=4600.844..64493.259 rows=15352973 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=252320 read=39518 dirtied=253 written=11
                     ->  Seq Scan on orders  (cost=0.00..446496.39 rows=15043336 width=8) (actual time=0.055..20461.134 rows=14852952 loops=1)
                           Filter: ((o_comment)::text !~~ '%pending%deposits%'::text)
                           Rows Removed by Filter: 162048
                           Buffers: shared hit=252316 read=4244 dirtied=253 written=1
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=4598.858..4598.858 rows=1500000 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 52735kB
                           Buffers: shared hit=4 read=35274 written=10
                           ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=4) (actual time=0.012..3742.095 rows=1500000 loops=1)
                                 Buffers: shared hit=4 read=35274 written=10
 Total runtime: 87501.033 ms
(21 rows)

COMMIT;
COMMIT