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 '%burnished%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                   QUERY PLAN                                                                                   
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3601879.64..3601884.82 rows=148 width=46) (actual time=438778.178..442294.375 rows=175 loops=1)
   Buffers: shared hit=30314703 read=602432 dirtied=176 written=4711
   ->  Sort  (cost=3601879.64..3601880.01 rows=148 width=46) (actual time=438763.387..439748.679 rows=3259910 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 556729kB
         Buffers: shared hit=30314703 read=602432 dirtied=176 written=4711
         ->  Nested Loop  (cost=2930442.71..3601874.30 rows=148 width=46) (actual time=143606.153..412741.613 rows=3259910 loops=1)
               Buffers: shared hit=30314695 read=602432 dirtied=176 written=4711
               ->  Nested Loop  (cost=2930442.71..3601832.09 rows=148 width=24) (actual time=143606.077..380379.693 rows=3259910 loops=1)
                     Buffers: shared hit=23794875 read=602432 dirtied=176 written=4711
                     ->  Nested Loop  (cost=2930442.71..3601543.77 rows=148 width=24) (actual time=143605.954..224989.148 rows=3259910 loops=1)
                           Buffers: shared hit=10996565 read=343294 written=1701
                           ->  Merge Join  (cost=2930442.71..3601500.67 rows=148 width=28) (actual time=143605.886..164833.941 rows=3259910 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=1200980 read=340923 written=1697
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.29 rows=8000000 width=12) (actual time=0.011..12083.257 rows=7999941 loops=1)
                                       Buffers: shared hit=290853 read=143355 written=899
                                 ->  Sort  (cost=2930442.54..2939764.78 rows=3728896 width=28) (actual time=143605.719..147616.559 rows=3259910 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 352985kB
                                       Buffers: shared hit=910127 read=197568 written=798
                                       ->  Hash Join  (cost=67073.52..2523427.63 rows=3728896 width=28) (actual time=2047.545..134427.587 rows=3259910 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=910124 read=197568 written=798
                                             ->  Seq Scan on lineitem  (cost=0.00..1668010.62 rows=60084362 width=24) (actual time=0.032..27269.569 rows=59985329 loops=1)
                                                   Buffers: shared hit=887506 read=179661 written=2
                                             ->  Hash  (cost=65522.00..65522.00 rows=124122 width=4) (actual time=2047.272..2047.272 rows=108708 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3822kB
                                                   Buffers: shared hit=22615 read=17907 written=796
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=124122 width=4) (actual time=0.024..1961.898 rows=108708 loops=1)
                                                         Filter: ((p_name)::text ~~ '%burnished%'::text)
                                                         Rows Removed by Filter: 1891292
                                                         Buffers: shared hit=22615 read=17907 written=796
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.017..0.017 rows=1 loops=3259910)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9795585 read=2371 written=4
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.00..1.94 rows=1 width=8) (actual time=0.046..0.046 rows=1 loops=3259910)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3259910
                           Buffers: shared hit=12798310 read=259138 dirtied=176 written=3010
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.007..0.007 rows=1 loops=3259910)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6519820
 Total runtime: 442439.015 ms
(44 rows)

COMMIT;
COMMIT