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 'metallic%'
			and ps_availqty > (
				select
					0.5 * sum(l_quantity)
				from
					lineitem
				where
					l_partkey = ps_partkey
					and l_suppkey = ps_suppkey
					and l_shipdate >= '1993-01-01'
					and l_shipdate < cast(date '1993-01-01' + interval '1 year' as date)
			)
	)
	and s_nationkey = n_nationkey
	and n_name = 'IRAN'
order by
	s_name;
                                                                                                  QUERY PLAN                                                                                                   
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=12740755.70..12740758.64 rows=1175 width=51) (actual time=45790.880..45791.027 rows=1788 loops=1)
   Sort Key: supplier.s_name
   Sort Method: quicksort  Memory: 258kB
   Buffers: shared hit=2750279 read=353544 dirtied=747 written=10074
   ->  Nested Loop  (cost=12736286.07..12740695.78 rows=1175 width=51) (actual time=45502.983..45781.432 rows=1788 loops=1)
         Join Filter: (supplier.s_nationkey = nation.n_nationkey)
         Rows Removed by Join Filter: 42726
         Buffers: shared hit=2750274 read=353544 dirtied=747 written=10074
         ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.017..0.028 rows=1 loops=1)
               Filter: (n_name = 'IRAN'::bpchar)
               Rows Removed by Filter: 24
               Buffers: shared hit=1
         ->  Hash Semi Join  (cost=12736286.07..12740327.43 rows=29363 width=55) (actual time=45502.903..45773.828 rows=44514 loops=1)
               Hash Cond: (supplier.s_suppkey = partsupp.ps_suppkey)
               Buffers: shared hit=2750273 read=353544 dirtied=747 written=10074
               ->  Seq Scan on supplier  (cost=0.00..3179.00 rows=100000 width=59) (actual time=0.015..85.935 rows=100000 loops=1)
                     Buffers: shared hit=2179
               ->  Hash  (cost=12735919.03..12735919.03 rows=29363 width=4) (actual time=45502.839..45502.839 rows=44514 loops=1)
                     Buckets: 4096  Batches: 1  Memory Usage: 1565kB
                     Buffers: shared hit=2748094 read=353544 dirtied=747 written=10074
                     ->  HashAggregate  (cost=12735331.77..12735625.40 rows=29363 width=4) (actual time=45460.606..45488.144 rows=44514 loops=1)
                           Buffers: shared hit=2748094 read=353544 dirtied=747 written=10074
                           ->  Nested Loop  (cost=0.00..12735258.36 rows=29363 width=4) (actual time=0.968..45297.751 rows=58683 loops=1)
                                 Buffers: shared hit=2748094 read=353544 dirtied=747 written=10074
                                 ->  Seq Scan on part  (cost=0.00..65522.00 rows=22022 width=4) (actual time=0.131..1623.060 rows=21737 loops=1)
                                       Filter: ((p_name)::text ~~ 'metallic%'::text)
                                       Rows Removed by Filter: 1978263
                                       Buffers: shared hit=31814 read=8708 written=327
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..575.31 rows=1 width=8) (actual time=1.438..2.005 rows=3 loops=21737)
                                       Index Cond: (ps_partkey = part.p_partkey)
                                       Filter: ((ps_availqty)::double precision > (SubPlan 1))
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=2716280 read=344836 dirtied=747 written=9747
                                       SubPlan 1
                                         ->  Aggregate  (cost=140.92..140.94 rows=1 width=4) (actual time=0.476..0.476 rows=1 loops=86948)
                                               Buffers: shared hit=2644589 read=326801 dirtied=747 written=9288
                                               ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.92 rows=1 width=4) (actual time=0.301..0.472 rows=1 loops=86948)
                                                     Index Cond: (l_partkey = partsupp.ps_partkey)
                                                     Filter: ((l_shipdate >= '1993-01-01'::date) AND (l_shipdate < '1994-01-01'::date) AND (l_suppkey = partsupp.ps_suppkey))
                                                     Rows Removed by Filter: 29
                                                     Buffers: shared hit=2644589 read=326801 dirtied=747 written=9288
 Total runtime: 45793.127 ms
(42 rows)

COMMIT;
COMMIT