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 '%beige%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1246863.86..1246868.73 rows=139 width=46) (actual time=130709.404..133819.060 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35513894 read=2438894 dirtied=13040 written=16796
   ->  Sort  (cost=1246863.86..1246864.21 rows=139 width=46) (actual time=130696.738..131614.985 rows=3260481 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 556810kB
         Buffers: shared hit=35513894 read=2438894 dirtied=13040 written=16796
         ->  Hash Join  (cost=66951.24..1246858.92 rows=139 width=46) (actual time=1039.018..118012.233 rows=3260481 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35513886 read=2438894 dirtied=13040 written=16796
               ->  Nested Loop  (cost=66949.68..1246854.75 rows=139 width=24) (actual time=1038.951..114312.840 rows=3260481 loops=1)
                     Buffers: shared hit=35513882 read=2438894 dirtied=13040 written=16796
                     ->  Nested Loop  (cost=66949.24..1246787.38 rows=139 width=24) (actual time=1038.861..60858.994 rows=3260481 loops=1)
                           Buffers: shared hit=23264473 read=1628702 dirtied=12960 written=11945
                           ->  Nested Loop  (cost=66948.95..1246742.53 rows=139 width=28) (actual time=1038.844..47688.156 rows=3260481 loops=1)
                                 Buffers: shared hit=13465300 read=1628702 dirtied=12960 written=11945
                                 ->  Hash Join  (cost=66948.39..352470.83 rows=456444 width=16) (actual time=1038.707..6771.402 rows=434360 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=81492 read=129988 written=732
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.007..2976.887 rows=8000000 loops=1)
                                             Buffers: shared hit=72176 read=98782 written=695
                                       ->  Hash  (cost=65522.00..65522.00 rows=114111 width=4) (actual time=1038.017..1038.017 rows=108590 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4842kB
                                             Buffers: shared hit=9316 read=31206 written=37
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=114111 width=4) (actual time=0.018..996.933 rows=108590 loops=1)
                                                   Filter: ((p_name)::text ~~ '%beige%'::text)
                                                   Rows Removed by Filter: 1891410
                                                   Buffers: shared hit=9316 read=31206 written=37
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.95 rows=1 width=24) (actual time=0.018..0.091 rows=8 loops=434360)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13383808 read=1498714 dirtied=12960 written=11213
                           ->  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=3260481)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9799173
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.015..0.016 rows=1 loops=3260481)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3260481
                           Buffers: shared hit=12249409 read=810192 dirtied=80 written=4851
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.021..0.021 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=0.006..0.009 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 33.201 ms
 Execution time: 133866.380 ms
(47 rows)

COMMIT;
COMMIT