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 '%aquamarine%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1150780.22..1150784.52 rows=123 width=46) (actual time=135708.805..139340.731 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35635617 read=2289799 dirtied=4806 written=11261
   ->  Sort  (cost=1150780.22..1150780.52 rows=123 width=46) (actual time=135695.175..137065.435 rows=3258453 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 556524kB
         Buffers: shared hit=35635617 read=2289799 dirtied=4806 written=11261
         ->  Hash Join  (cost=66801.09..1150775.95 rows=123 width=46) (actual time=1186.334..120853.800 rows=3258453 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35635609 read=2289799 dirtied=4806 written=11261
               ->  Nested Loop  (cost=66799.53..1150772.08 rows=123 width=24) (actual time=1186.262..117035.188 rows=3258453 loops=1)
                     Buffers: shared hit=35635605 read=2289799 dirtied=4806 written=11261
                     ->  Nested Loop  (cost=66799.10..1150712.47 rows=123 width=24) (actual time=1186.138..63190.547 rows=3258453 loops=1)
                           Buffers: shared hit=23221354 read=1652577 dirtied=4730 written=8347
                           ->  Nested Loop  (cost=66798.80..1150672.78 rows=123 width=28) (actual time=1186.121..48681.788 rows=3258453 loops=1)
                                 Buffers: shared hit=13428183 read=1652577 dirtied=4730 written=8347
                                 ->  Hash Join  (cost=66798.24..351840.20 rows=408396 width=16) (actual time=1186.043..6803.868 rows=434220 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=56359 read=155121 written=710
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.008..3204.545 rows=8000000 loops=1)
                                             Buffers: shared hit=55552 read=115406 written=710
                                       ->  Hash  (cost=65522.00..65522.00 rows=102099 width=4) (actual time=1185.380..1185.380 rows=108555 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4841kB
                                             Buffers: shared hit=807 read=39715
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=102099 width=4) (actual time=0.019..1142.946 rows=108555 loops=1)
                                                   Filter: ((p_name)::text ~~ '%aquamarine%'::text)
                                                   Rows Removed by Filter: 1891445
                                                   Buffers: shared hit=807 read=39715
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.95 rows=1 width=24) (actual time=0.019..0.093 rows=8 loops=434220)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13371824 read=1497456 dirtied=4730 written=7637
                           ->  Index Scan using pk_supplier on supplier  (cost=0.29..0.31 rows=1 width=8) (actual time=0.003..0.004 rows=1 loops=3258453)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9793171
                     ->  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=3258453)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3258453
                           Buffers: shared hit=12414251 read=637222 dirtied=76 written=2914
               ->  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..0.010 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 32.712 ms
 Execution time: 139417.326 ms
(47 rows)

COMMIT;
COMMIT