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 'green%'
			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 = 'CHINA'
order by
	s_name;
                                                                                                  QUERY PLAN                                                                                                   
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=12740736.73..12740739.65 rows=1168 width=51) (actual time=13333.468..13333.587 rows=1721 loops=1)
   Sort Key: supplier.s_name
   Sort Method: quicksort  Memory: 250kB
   Buffers: shared hit=2680157 read=411023 dirtied=4622 written=73
   ->  Nested Loop  (cost=12736272.49..12740677.22 rows=1168 width=51) (actual time=13218.579..13324.028 rows=1721 loops=1)
         Join Filter: (supplier.s_nationkey = nation.n_nationkey)
         Rows Removed by Join Filter: 42730
         Buffers: shared hit=2680152 read=411023 dirtied=4622 written=73
         ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.012..0.020 rows=1 loops=1)
               Filter: (n_name = 'CHINA'::bpchar)
               Rows Removed by Filter: 24
               Buffers: shared hit=1
         ->  Hash Semi Join  (cost=12736272.49..12740310.92 rows=29199 width=55) (actual time=13218.551..13319.072 rows=44451 loops=1)
               Hash Cond: (supplier.s_suppkey = partsupp.ps_suppkey)
               Buffers: shared hit=2680151 read=411023 dirtied=4622 written=73
               ->  Seq Scan on supplier  (cost=0.00..3179.00 rows=100000 width=59) (actual time=0.016..28.731 rows=100000 loops=1)
                     Buffers: shared hit=2179
               ->  Hash  (cost=12735907.50..12735907.50 rows=29199 width=4) (actual time=13218.487..13218.487 rows=44451 loops=1)
                     Buckets: 4096  Batches: 1  Memory Usage: 1563kB
                     Buffers: shared hit=2677972 read=411023 dirtied=4622 written=73
                     ->  HashAggregate  (cost=12735323.52..12735615.51 rows=29199 width=4) (actual time=13185.652..13207.818 rows=44451 loops=1)
                           Buffers: shared hit=2677972 read=411023 dirtied=4622 written=73
                           ->  Nested Loop  (cost=0.00..12735250.53 rows=29199 width=4) (actual time=1.033..13080.758 rows=58466 loops=1)
                                 Buffers: shared hit=2677972 read=411023 dirtied=4622 written=73
                                 ->  Seq Scan on part  (cost=0.00..65522.00 rows=22022 width=4) (actual time=0.012..1035.906 rows=21556 loops=1)
                                       Filter: ((p_name)::text ~~ 'green%'::text)
                                       Rows Removed by Filter: 1978444
                                       Buffers: shared hit=17604 read=22918
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..575.31 rows=1 width=8) (actual time=0.444..0.556 rows=3 loops=21556)
                                       Index Cond: (ps_partkey = part.p_partkey)
                                       Filter: ((ps_availqty)::double precision > (SubPlan 1))
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=2660368 read=388105 dirtied=4622 written=73
                                       SubPlan 1
                                         ->  Aggregate  (cost=140.92..140.94 rows=1 width=4) (actual time=0.130..0.130 rows=1 loops=86224)
                                               Buffers: shared hit=2584362 read=375098 dirtied=4622 written=71
                                               ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.92 rows=1 width=4) (actual time=0.080..0.128 rows=1 loops=86224)
                                                     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=2584362 read=375098 dirtied=4622 written=71
 Total runtime: 13335.288 ms
(42 rows)

COMMIT;
COMMIT