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 '%antique%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=993949.48..993952.94 rows=99 width=46) (actual time=122686.487..126236.060 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35347930 read=2414175 dirtied=14971 written=31317
   ->  Sort  (cost=993949.48..993949.73 rows=99 width=46) (actual time=122674.433..123999.029 rows=3242193 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 554238kB
         Buffers: shared hit=35347930 read=2414175 dirtied=14971 written=31317
         ->  Hash Join  (cost=66550.85..993946.20 rows=99 width=46) (actual time=1208.582..108488.557 rows=3242193 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35347922 read=2414175 dirtied=14971 written=31317
               ->  Nested Loop  (cost=66549.29..993942.78 rows=99 width=24) (actual time=1208.522..105047.552 rows=3242193 loops=1)
                     Buffers: shared hit=35347918 read=2414175 dirtied=14971 written=31317
                     ->  Nested Loop  (cost=66548.86..993894.80 rows=99 width=24) (actual time=1208.418..55186.801 rows=3242193 loops=1)
                           Buffers: shared hit=23113748 read=1661996 dirtied=14942 written=21926
                           ->  Nested Loop  (cost=66548.57..993862.85 rows=99 width=28) (actual time=1208.402..42918.715 rows=3242193 loops=1)
                                 Buffers: shared hit=13369502 read=1661996 dirtied=14942 written=21926
                                 ->  Hash Join  (cost=66548.00..350789.20 rows=328320 width=16) (actual time=1208.329..5958.232 rows=432700 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=66934 read=144546 written=695
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.003..2596.873 rows=8000000 loops=1)
                                             Buffers: shared hit=66932 read=104026 written=661
                                       ->  Hash  (cost=65522.00..65522.00 rows=82080 width=4) (actual time=1207.606..1207.606 rows=108175 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4828kB
                                             Buffers: shared hit=2 read=40520 written=34
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=82080 width=4) (actual time=0.068..1161.799 rows=108175 loops=1)
                                                   Filter: ((p_name)::text ~~ '%antique%'::text)
                                                   Rows Removed by Filter: 1891825
                                                   Buffers: shared hit=2 read=40520 written=34
                                 ->  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..0.083 rows=7 loops=432700)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 22
                                       Buffers: shared hit=13302568 read=1517450 dirtied=14942 written=21231
                           ->  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=3242193)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9744246
                     ->  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=3242193)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3242193
                           Buffers: shared hit=12234170 read=752179 dirtied=29 written=9391
               ->  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: 35.034 ms
 Execution time: 126312.787 ms
(47 rows)

COMMIT;
COMMIT