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 '%red%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1103476.04..1103480.13 rows=117 width=46) (actual time=108963.172..112464.887 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35867452 read=2251382 dirtied=7739 written=27702
   ->  Sort  (cost=1103476.04..1103476.33 rows=117 width=46) (actual time=108949.214..110170.924 rows=3275459 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 558916kB
         Buffers: shared hit=35867452 read=2251382 dirtied=7739 written=27702
         ->  Hash Join  (cost=66726.03..1103472.02 rows=117 width=46) (actual time=1162.630..97832.820 rows=3275459 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35867444 read=2251382 dirtied=7739 written=27702
               ->  Nested Loop  (cost=66724.47..1103468.26 rows=117 width=24) (actual time=1162.533..94991.151 rows=3275459 loops=1)
                     Buffers: shared hit=35867440 read=2251382 dirtied=7739 written=27702
                     ->  Nested Loop  (cost=66724.03..1103411.56 rows=117 width=24) (actual time=1162.496..50702.693 rows=3275459 loops=1)
                           Buffers: shared hit=23430811 read=1568446 dirtied=7275 written=16883
                           ->  Nested Loop  (cost=66723.74..1103373.81 rows=117 width=28) (actual time=1162.470..39563.961 rows=3275459 loops=1)
                                 Buffers: shared hit=13586446 read=1568446 dirtied=7275 written=16883
                                 ->  Hash Join  (cost=66723.18..351524.93 rows=384376 width=16) (actual time=1162.381..5755.155 rows=436376 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=81359 read=130121 written=821
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.004..2391.111 rows=8000000 loops=1)
                                             Buffers: shared hit=78605 read=92353 written=821
                                       ->  Hash  (cost=65522.00..65522.00 rows=96094 width=4) (actual time=1161.464..1161.464 rows=109094 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4860kB
                                             Buffers: shared hit=2754 read=37768
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=96094 width=4) (actual time=0.026..1106.078 rows=109094 loops=1)
                                                   Filter: ((p_name)::text ~~ '%red%'::text)
                                                   Rows Removed by Filter: 1890906
                                                   Buffers: shared hit=2754 read=37768
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.95 rows=1 width=24) (actual time=0.015..0.075 rows=8 loops=436376)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13505087 read=1438325 dirtied=7275 written=16062
                           ->  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=3275459)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9844365
                     ->  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=3275459)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12436629 read=682936 dirtied=464 written=10819
               ->  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=0.009..0.011 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 32.005 ms
 Execution time: 112555.486 ms
(46 rows)

COMMIT;
COMMIT