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 '%deep%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                  QUERY PLAN                                                                                   
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3466114.22..3466118.81 rows=131 width=46) (actual time=193422.807..196718.963 rows=175 loops=1)
   Buffers: shared hit=30138877 read=707459 dirtied=25 written=2851
   ->  Sort  (cost=3466114.22..3466114.55 rows=131 width=46) (actual time=193407.550..194429.132 rows=3251918 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 555605kB
         Buffers: shared hit=30138877 read=707459 dirtied=25 written=2851
         ->  Nested Loop  (cost=2798296.80..3466109.61 rows=131 width=46) (actual time=95701.395..173356.524 rows=3251918 loops=1)
               Buffers: shared hit=30138869 read=707459 dirtied=25 written=2851
               ->  Nested Loop  (cost=2798296.80..3466072.25 rows=131 width=24) (actual time=95701.302..163327.578 rows=3251918 loops=1)
                     Buffers: shared hit=23635033 read=707459 dirtied=25 written=2851
                     ->  Nested Loop  (cost=2798296.80..3465816.18 rows=131 width=24) (actual time=95701.230..118004.411 rows=3251918 loops=1)
                           Buffers: shared hit=10763558 read=553215 written=2282
                           ->  Merge Join  (cost=2798296.80..3465778.03 rows=131 width=28) (actual time=95701.153..105769.988 rows=3251918 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=990786 read=552558 written=2282
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.29 rows=8000000 width=12) (actual time=0.009..4574.507 rows=7999949 loops=1)
                                       Buffers: shared hit=281485 read=152723 written=2282
                                 ->  Sort  (cost=2798294.63..2806424.94 rows=3252122 width=28) (actual time=95701.000..97989.036 rows=3251918 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 352361kB
                                       Buffers: shared hit=709301 read=399835
                                       ->  Hash Join  (cost=66873.31..2446529.67 rows=3252122 width=28) (actual time=1470.050..91503.124 rows=3251918 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=709298 read=399835
                                             ->  Seq Scan on lineitem  (cost=0.00..1670267.83 rows=60165983 width=24) (actual time=0.034..16120.264 rows=60045379 loops=1)
                                                   Buffers: shared hit=699448 read=369160
                                             ->  Hash  (cost=65522.00..65522.00 rows=108105 width=4) (actual time=1469.555..1469.555 rows=108399 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3811kB
                                                   Buffers: shared hit=9847 read=30675
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=108105 width=4) (actual time=0.023..1399.953 rows=108399 loops=1)
                                                         Filter: ((p_name)::text ~~ '%deep%'::text)
                                                         Rows Removed by Filter: 1891601
                                                         Buffers: shared hit=9847 read=30675
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.003..0.003 rows=1 loops=3251918)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9772772 read=657
                     ->  Index Scan using pk_orders on orders  (cost=0.00..1.94 rows=1 width=8) (actual time=0.013..0.013 rows=1 loops=3251918)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12871475 read=154244 dirtied=25 written=569
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.002..0.002 rows=1 loops=3251918)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6503836
 Total runtime: 196844.841 ms
(43 rows)

COMMIT;
COMMIT