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=1194617.98..1194622.53 rows=130 width=46) (actual time=111141.255..114145.541 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35701978 read=2231957 dirtied=11637 written=23005
   ->  Sort  (cost=1194617.98..1194618.30 rows=130 width=46) (actual time=111130.371..112016.778 rows=3258999 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 556601kB
         Buffers: shared hit=35701978 read=2231957 dirtied=11637 written=23005
         ->  Hash Join  (cost=66876.19..1194613.41 rows=130 width=46) (actual time=990.735..100167.781 rows=3258999 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35701970 read=2231957 dirtied=11637 written=23005
               ->  Nested Loop  (cost=66874.63..1194609.41 rows=130 width=24) (actual time=990.660..97123.610 rows=3258999 loops=1)
                     Buffers: shared hit=35701966 read=2231957 dirtied=11637 written=23005
                     ->  Nested Loop  (cost=66874.19..1194546.41 rows=130 width=24) (actual time=990.631..51459.220 rows=3258999 loops=1)
                           Buffers: shared hit=23271178 read=1608790 dirtied=11532 written=16531
                           ->  Nested Loop  (cost=66873.90..1194504.46 rows=130 width=28) (actual time=990.621..39786.900 rows=3258999 loops=1)
                                 Buffers: shared hit=13476063 read=1608790 dirtied=11532 written=16531
                                 ->  Hash Join  (cost=66873.34..352135.53 rows=430419 width=16) (actual time=990.581..5813.403 rows=434008 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=49437 read=162043 written=1298
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.012..2623.556 rows=8000000 loops=1)
                                             Buffers: shared hit=40252 read=130706 written=1298
                                       ->  Hash  (cost=65522.00..65522.00 rows=108107 width=4) (actual time=989.966..989.966 rows=108502 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4839kB
                                             Buffers: shared hit=9185 read=31337
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=108107 width=4) (actual time=0.018..950.175 rows=108502 loops=1)
                                                   Filter: ((p_name)::text ~~ '%misty%'::text)
                                                   Rows Removed by Filter: 1891498
                                                   Buffers: shared hit=9185 read=31337
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.95 rows=1 width=24) (actual time=0.016..0.076 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=13426626 read=1446747 dirtied=11532 written=15233
                           ->  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=3258999)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9795115
                     ->  Index Scan using pk_orders on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.013..0.013 rows=1 loops=3258999)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12430788 read=623167 dirtied=105 written=6474
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.028..0.028 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: 31.026 ms
 Execution time: 114194.843 ms
(46 rows)

COMMIT;
COMMIT