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 '%green%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1213299.79..1213304.44 rows=133 width=46) (actual time=104029.804..107099.764 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35827999 read=2127291 dirtied=3847 written=18192
   ->  Sort  (cost=1213299.79..1213300.12 rows=133 width=46) (actual time=104018.442..105023.388 rows=3261661 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 556976kB
         Buffers: shared hit=35827999 read=2127291 dirtied=3847 written=18192
         ->  Hash Join  (cost=66901.21..1213295.10 rows=133 width=46) (actual time=830.800..94237.690 rows=3261661 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35827991 read=2127291 dirtied=3847 written=18192
               ->  Nested Loop  (cost=66899.64..1213291.04 rows=133 width=24) (actual time=830.745..91451.514 rows=3261661 loops=1)
                     Buffers: shared hit=35827987 read=2127291 dirtied=3847 written=18192
                     ->  Nested Loop  (cost=66899.21..1213226.59 rows=133 width=24) (actual time=830.719..48155.063 rows=3261661 loops=1)
                           Buffers: shared hit=23505968 read=1384779 dirtied=3713 written=10121
                           ->  Nested Loop  (cost=66898.92..1213183.67 rows=133 width=28) (actual time=830.707..36877.374 rows=3261661 loops=1)
                                 Buffers: shared hit=13703372 read=1384779 dirtied=3713 written=10121
                                 ->  Hash Join  (cost=66898.35..352260.67 rows=440432 width=16) (actual time=830.602..4838.070 rows=435128 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=142063 read=69417 written=398
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.007..2111.207 rows=8000000 loops=1)
                                             Buffers: shared hit=101541 read=69417 written=398
                                       ->  Hash  (cost=65522.00..65522.00 rows=110108 width=4) (actual time=829.779..829.779 rows=108782 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4849kB
                                             Buffers: shared hit=40522
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=110108 width=4) (actual time=0.012..792.236 rows=108782 loops=1)
                                                   Filter: ((p_name)::text ~~ '%green%'::text)
                                                   Rows Removed by Filter: 1891218
                                                   Buffers: shared hit=40522
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.94 rows=1 width=24) (actual time=0.015..0.071 rows=7 loops=435128)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 22
                                       Buffers: shared hit=13561309 read=1315362 dirtied=3713 written=9723
                           ->  Index Scan using pk_supplier on supplier  (cost=0.29..0.31 rows=1 width=8) (actual time=0.002..0.003 rows=1 loops=3261661)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9802596
                     ->  Index Scan using pk_orders on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.012..0.013 rows=1 loops=3261661)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12322019 read=742512 dirtied=134 written=8071
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.019..0.019 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=0.005..0.007 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 29.168 ms
 Execution time: 107197.089 ms
(46 rows)

COMMIT;
COMMIT