BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	s_name,
	s_address
from
	supplier,
	nation
where
	s_suppkey in (
		select
			distinct (ps_suppkey)
		from
			partsupp,
			part
		where
			ps_partkey=p_partkey
			and p_name like 'firebrick%'
			and ps_availqty > (
				select
					0.5 * sum(l_quantity)
				from
					lineitem
				where
					l_partkey = ps_partkey
					and l_suppkey = ps_suppkey
					and l_shipdate >= '1995-01-01'
					and l_shipdate < cast(date '1995-01-01' + interval '1 year' as date)
			)
	)
	and s_nationkey = n_nationkey
	and n_name = 'CANADA'
order by
	s_name;
                                                                                                  QUERY PLAN                                                                                                   
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=12740756.53..12740759.47 rows=1175 width=51) (actual time=24345.093..24345.258 rows=1823 loops=1)
   Sort Key: supplier.s_name
   Sort Method: quicksort  Memory: 260kB
   Buffers: shared hit=2711331 read=398501 dirtied=1617 written=5090
   ->  Nested Loop  (cost=12736286.90..12740696.61 rows=1175 width=51) (actual time=24065.063..24335.469 rows=1823 loops=1)
         Join Filter: (supplier.s_nationkey = nation.n_nationkey)
         Rows Removed by Join Filter: 43018
         Buffers: shared hit=2711326 read=398501 dirtied=1617 written=5090
         ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.014..0.030 rows=1 loops=1)
               Filter: (n_name = 'CANADA'::bpchar)
               Rows Removed by Filter: 24
               Buffers: shared hit=1
         ->  Hash Semi Join  (cost=12736286.90..12740328.26 rows=29363 width=55) (actual time=24064.840..24327.717 rows=44841 loops=1)
               Hash Cond: (supplier.s_suppkey = partsupp.ps_suppkey)
               Buffers: shared hit=2711325 read=398501 dirtied=1617 written=5090
               ->  Seq Scan on supplier  (cost=0.00..3179.00 rows=100000 width=59) (actual time=0.027..52.997 rows=100000 loops=1)
                     Buffers: shared hit=2179
               ->  Hash  (cost=12735919.86..12735919.86 rows=29363 width=4) (actual time=24064.753..24064.753 rows=44841 loops=1)
                     Buckets: 4096  Batches: 1  Memory Usage: 1577kB
                     Buffers: shared hit=2709146 read=398501 dirtied=1617 written=5090
                     ->  HashAggregate  (cost=12735332.60..12735626.23 rows=29363 width=4) (actual time=24002.568..24031.472 rows=44841 loops=1)
                           Buffers: shared hit=2709146 read=398501 dirtied=1617 written=5090
                           ->  Nested Loop  (cost=0.00..12735259.19 rows=29363 width=4) (actual time=2.679..23864.001 rows=59125 loops=1)
                                 Buffers: shared hit=2709146 read=398501 dirtied=1617 written=5090
                                 ->  Seq Scan on part  (cost=0.00..65522.00 rows=22022 width=4) (actual time=0.111..1788.266 rows=21696 loops=1)
                                       Filter: ((p_name)::text ~~ 'firebrick%'::text)
                                       Rows Removed by Filter: 1978304
                                       Buffers: shared hit=253 read=40269 written=452
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..575.31 rows=1 width=8) (actual time=0.761..1.014 rows=3 loops=21696)
                                       Index Cond: (ps_partkey = part.p_partkey)
                                       Filter: ((ps_availqty)::double precision > (SubPlan 1))
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=2708893 read=358232 dirtied=1617 written=4638
                                       SubPlan 1
                                         ->  Aggregate  (cost=140.92..140.94 rows=1 width=4) (actual time=0.238..0.238 rows=1 loops=86784)
                                               Buffers: shared hit=2635682 read=341747 dirtied=1617 written=4364
                                               ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.92 rows=1 width=4) (actual time=0.150..0.235 rows=1 loops=86784)
                                                     Index Cond: (l_partkey = partsupp.ps_partkey)
                                                     Filter: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate < '1996-01-01'::date) AND (l_suppkey = partsupp.ps_suppkey))
                                                     Rows Removed by Filter: 29
                                                     Buffers: shared hit=2635682 read=341747 dirtied=1617 written=4364
 Total runtime: 24347.895 ms
(42 rows)

COMMIT;
COMMIT