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 '%plum%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=994133.02..994136.48 rows=99 width=46) (actual time=120995.317..124723.184 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35627562 read=2356511 dirtied=14561 written=17522
   ->  Sort  (cost=994133.02..994133.27 rows=99 width=46) (actual time=120982.952..122383.003 rows=3262688 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 557120kB
         Buffers: shared hit=35627562 read=2356511 dirtied=14561 written=17522
         ->  Hash Join  (cost=66550.87..994129.74 rows=99 width=46) (actual time=1067.691..108194.476 rows=3262688 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35627554 read=2356511 dirtied=14561 written=17522
               ->  Nested Loop  (cost=66549.30..994126.32 rows=99 width=24) (actual time=1067.631..105071.071 rows=3262688 loops=1)
                     Buffers: shared hit=35627550 read=2356511 dirtied=14561 written=17522
                     ->  Nested Loop  (cost=66548.87..994078.34 rows=99 width=24) (actual time=1067.494..55536.552 rows=3262688 loops=1)
                           Buffers: shared hit=23287756 read=1627617 dirtied=14365 written=10706
                           ->  Nested Loop  (cost=66548.58..994046.39 rows=99 width=28) (actual time=1067.475..42633.257 rows=3262688 loops=1)
                                 Buffers: shared hit=13482377 read=1627617 dirtied=14365 written=10706
                                 ->  Hash Join  (cost=66548.01..350789.25 rows=328324 width=16) (actual time=1067.312..5894.237 rows=434892 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=58396 read=153084 written=674
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.006..2607.883 rows=8000000 loops=1)
                                             Buffers: shared hit=56584 read=114374 written=579
                                       ->  Hash  (cost=65522.00..65522.00 rows=82081 width=4) (actual time=1066.483..1066.483 rows=108723 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4847kB
                                             Buffers: shared hit=1812 read=38710 written=95
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=82081 width=4) (actual time=0.068..1024.743 rows=108723 loops=1)
                                                   Filter: ((p_name)::text ~~ '%plum%'::text)
                                                   Rows Removed by Filter: 1891277
                                                   Buffers: shared hit=1812 read=38710 written=95
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.95 rows=1 width=24) (actual time=0.017..0.082 rows=8 loops=434892)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13423981 read=1474533 dirtied=14365 written=10032
                           ->  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=3262688)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9805379
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.014..0.015 rows=1 loops=3262688)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3262688
                           Buffers: shared hit=12339794 read=728894 dirtied=196 written=6816
               ->  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: 32.889 ms
 Execution time: 124782.249 ms
(47 rows)

COMMIT;
COMMIT