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 '%lemon%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                      QUERY PLAN                                                                                      
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1191500.23..1191504.92 rows=134 width=46) (actual time=94011.999..96832.001 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35896288 read=2029920 dirtied=11084 written=16857
   ->  Sort  (cost=1191500.23..1191500.56 rows=134 width=46) (actual time=94001.862..94636.502 rows=3261121 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 556900kB
         Buffers: shared hit=35896288 read=2029920 dirtied=11084 written=16857
         ->  Hash Join  (cost=66926.23..1191495.49 rows=134 width=46) (actual time=971.999..88151.439 rows=3261121 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35896280 read=2029920 dirtied=11084 written=16857
               ->  Nested Loop  (cost=66924.67..1191491.42 rows=134 width=24) (actual time=971.939..84871.763 rows=3261121 loops=1)
                     Buffers: shared hit=35896276 read=2029920 dirtied=11084 written=16857
                     ->  Nested Loop  (cost=66924.23..1191426.48 rows=134 width=24) (actual time=971.917..51264.741 rows=3261121 loops=1)
                           Buffers: shared hit=23403724 read=1460235 dirtied=10624 written=10500
                           ->  Nested Loop  (cost=66923.94..1191383.24 rows=134 width=28) (actual time=971.905..40562.205 rows=3261121 loops=1)
                                 Buffers: shared hit=13603147 read=1460235 dirtied=10624 written=10500
                                 ->  Hash Join  (cost=66923.38..352320.60 rows=443923 width=16) (actual time=971.849..5262.169 rows=434508 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=41975 read=169505 written=1170
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.004..2483.918 rows=8000000 loops=1)
                                             Buffers: shared hit=36762 read=134196 written=1170
                                       ->  Hash  (cost=65522.00..65522.00 rows=112110 width=4) (actual time=971.272..971.272 rows=108627 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4843kB
                                             Buffers: shared hit=5213 read=35309
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=112110 width=4) (actual time=0.015..925.928 rows=108627 loops=1)
                                                   Filter: ((p_name)::text ~~ '%lemon%'::text)
                                                   Rows Removed by Filter: 1891373
                                                   Buffers: shared hit=5213 read=35309
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem  (cost=0.56..1.88 rows=1 width=24) (actual time=0.015..0.079 rows=8 loops=434508)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13561172 read=1290730 dirtied=10624 written=9330
                           ->  Index Scan using pk_supplier on supplier  (cost=0.29..0.31 rows=1 width=8) (actual time=0.002..0.003 rows=1 loops=3261121)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9800577
                     ->  Index Scan using pk_orders on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.009..0.010 rows=1 loops=3261121)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12492552 read=569685 dirtied=460 written=6357
               ->  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=0.005..0.010 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 37.708 ms
 Execution time: 96863.135 ms
(46 rows)

COMMIT;
COMMIT