BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	nation,
	o_year,
	sum(amount) as sum_profit
from
	(
		select
			n_name as nation,
			extract(year from o_orderdate) as o_year,
			l_extendedprice * (1 - l_discount) - ps_supplycost * l_quantity as amount
		from
			part,
			supplier,
			lineitem,
			partsupp,
			orders,
			nation
		where
			s_suppkey = l_suppkey
			and ps_suppkey = l_suppkey
			and ps_partkey = l_partkey
			and p_partkey = l_partkey
			and o_orderkey = l_orderkey
			and s_nationkey = n_nationkey
			and p_name like '%maroon%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1166220.59..1166225.00 rows=126 width=46) (actual time=147416.933..151229.019 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35534797 read=2401602 dirtied=2976 written=9174
   ->  Sort  (cost=1166220.59..1166220.91 rows=126 width=46) (actual time=147402.535..148646.597 rows=3260728 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 556844kB
         Buffers: shared hit=35534797 read=2401602 dirtied=2976 written=9174
         ->  Hash Join  (cost=66826.29..1166216.20 rows=126 width=46) (actual time=1524.237..124355.574 rows=3260728 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35534789 read=2401602 dirtied=2976 written=9174
               ->  Nested Loop  (cost=66824.73..1166212.27 rows=126 width=24) (actual time=1524.156..120307.940 rows=3260728 loops=1)
                     Buffers: shared hit=35534785 read=2401602 dirtied=2976 written=9174
                     ->  Nested Loop  (cost=66824.29..1166151.21 rows=126 width=24) (actual time=1524.027..63947.425 rows=3260728 loops=1)
                           Buffers: shared hit=23252321 read=1623183 dirtied=2927 written=5505
                           ->  Nested Loop  (cost=66824.00..1166110.55 rows=126 width=28) (actual time=1524.006..49673.126 rows=3260728 loops=1)
                                 Buffers: shared hit=13453004 read=1623183 dirtied=2927 written=5505
                                 ->  Hash Join  (cost=66823.44..351946.04 rows=416460 width=16) (actual time=1523.903..7614.564 rows=434504 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=62438 read=149042 written=374
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.016..3068.754 rows=8000000 loops=1)
                                             Buffers: shared hit=52617 read=118341 written=374
                                       ->  Hash  (cost=65522.00..65522.00 rows=104115 width=4) (actual time=1523.109..1523.109 rows=108626 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4843kB
                                             Buffers: shared hit=9821 read=30701
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=104115 width=4) (actual time=0.021..1452.172 rows=108626 loops=1)
                                                   Filter: ((p_name)::text ~~ '%maroon%'::text)
                                                   Rows Removed by Filter: 1891374
                                                   Buffers: shared hit=9821 read=30701
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.94 rows=1 width=24) (actual time=0.019..0.094 rows=8 loops=434504)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13390566 read=1474141 dirtied=2927 written=5131
                           ->  Index Scan using pk_supplier on supplier  (cost=0.29..0.31 rows=1 width=8) (actual time=0.003..0.003 rows=1 loops=3260728)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9799317
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.016..0.016 rows=1 loops=3260728)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3260728
                           Buffers: shared hit=12282464 read=778419 dirtied=49 written=3669
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.027..0.027 rows=25 loops=1)
                     Buckets: 1024  Batches: 1  Memory Usage: 10kB
                     Buffers: shared hit=1
                     ->  Seq Scan on nation  (cost=0.00..1.25 rows=25 width=30) (actual time=0.007..0.011 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 53.068 ms
 Execution time: 151278.902 ms
(47 rows)

COMMIT;
COMMIT