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 '%misty%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1197880.14..1197884.69 rows=130 width=46) (actual time=119789.435..123162.932 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35520365 read=2381534 dirtied=5902 written=26291
   ->  Sort  (cost=1197880.14..1197880.46 rows=130 width=46) (actual time=119776.530..120851.425 rows=3255701 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 556137kB
         Buffers: shared hit=35520365 read=2381534 dirtied=5902 written=26291
         ->  Hash Join  (cost=66876.19..1197875.57 rows=130 width=46) (actual time=868.957..111220.282 rows=3255701 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35520357 read=2381534 dirtied=5902 written=26291
               ->  Nested Loop  (cost=66874.63..1197871.57 rows=130 width=24) (actual time=868.889..108093.287 rows=3255701 loops=1)
                     Buffers: shared hit=35520353 read=2381534 dirtied=5902 written=26291
                     ->  Nested Loop  (cost=66874.19..1197808.57 rows=130 width=24) (actual time=868.784..56816.468 rows=3255701 loops=1)
                           Buffers: shared hit=23258571 read=1602573 dirtied=5863 written=18059
                           ->  Nested Loop  (cost=66873.90..1197766.63 rows=130 width=28) (actual time=868.772..43882.721 rows=3255701 loops=1)
                                 Buffers: shared hit=13473369 read=1602573 dirtied=5863 written=18059
                                 ->  Hash Join  (cost=66873.34..352155.62 rows=432428 width=16) (actual time=868.733..6069.296 rows=434008 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=92314 read=119166 written=1276
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.005..2623.062 rows=8000000 loops=1)
                                             Buffers: shared hit=64971 read=105987 written=1276
                                       ->  Hash  (cost=65522.00..65522.00 rows=108107 width=4) (actual time=868.159..868.159 rows=108502 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4839kB
                                             Buffers: shared hit=27343 read=13179
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=108107 width=4) (actual time=0.012..828.926 rows=108502 loops=1)
                                                   Filter: ((p_name)::text ~~ '%misty%'::text)
                                                   Rows Removed by Filter: 1891498
                                                   Buffers: shared hit=27343 read=13179
                                 ->  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..0.085 rows=8 loops=434008)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13381055 read=1483407 dirtied=5863 written=16783
                           ->  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=3255701)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9785202
                     ->  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..0.015 rows=1 loops=3255701)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3255701
                           Buffers: shared hit=12261782 read=778961 dirtied=39 written=8232
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.020..0.020 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=0.004..0.007 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 33.037 ms
 Execution time: 123232.109 ms
(47 rows)

COMMIT;
COMMIT