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 '%moccasin%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1183905.11..1183909.62 rows=129 width=46) (actual time=128425.676..131633.583 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35423194 read=2608385 dirtied=12854 written=16317
   ->  Sort  (cost=1183905.11..1183905.43 rows=129 width=46) (actual time=128413.814..129484.070 rows=3265796 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 557557kB
         Buffers: shared hit=35423194 read=2608385 dirtied=12854 written=16317
         ->  Hash Join  (cost=66851.14..1183900.59 rows=129 width=46) (actual time=1198.741..114868.869 rows=3265796 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35423186 read=2608385 dirtied=12854 written=16317
               ->  Nested Loop  (cost=66849.58..1183896.61 rows=129 width=24) (actual time=1198.666..111389.171 rows=3265796 loops=1)
                     Buffers: shared hit=35423182 read=2608385 dirtied=12854 written=16317
                     ->  Nested Loop  (cost=66849.15..1183834.08 rows=129 width=24) (actual time=1198.551..57346.823 rows=3265796 loops=1)
                           Buffers: shared hit=23301137 read=1649590 dirtied=12703 written=12107
                           ->  Nested Loop  (cost=66848.85..1183792.46 rows=129 width=28) (actual time=1198.537..45039.868 rows=3265796 loops=1)
                                 Buffers: shared hit=13485770 read=1649589 dirtied=12703 written=12107
                                 ->  Hash Join  (cost=66848.29..352050.41 rows=424412 width=16) (actual time=1198.455..6434.331 rows=435564 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=86612 read=124868 written=540
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.011..2588.291 rows=8000000 loops=1)
                                             Buffers: shared hit=82416 read=88542 written=473
                                       ->  Hash  (cost=65522.00..65522.00 rows=106103 width=4) (actual time=1197.603..1197.603 rows=108891 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4853kB
                                             Buffers: shared hit=4196 read=36326 written=67
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=106103 width=4) (actual time=0.017..1151.688 rows=108891 loops=1)
                                                   Filter: ((p_name)::text ~~ '%moccasin%'::text)
                                                   Rows Removed by Filter: 1891109
                                                   Buffers: shared hit=4196 read=36326 written=67
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.95 rows=1 width=24) (actual time=0.018..0.086 rows=7 loops=435564)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 22
                                       Buffers: shared hit=13399158 read=1524721 dirtied=12703 written=11567
                           ->  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=3265796)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9815367 read=1
                     ->  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=3265796)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3265796
                           Buffers: shared hit=12122045 read=958795 dirtied=151 written=4210
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.026..0.026 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..0.009 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 54.785 ms
 Execution time: 131683.236 ms
(47 rows)

COMMIT;
COMMIT