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 'linen%'
			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 = 'CHINA'
order by
	s_name;
                                                                                               QUERY PLAN                                                                                                
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=11913182.05..11913184.71 rows=1062 width=51) (actual time=27707.031..27707.214 rows=1770 loops=1)
   Sort Key: supplier.s_name
   Sort Method: quicksort  Memory: 255kB
   Buffers: shared hit=2697440 read=417609 dirtied=5557 written=13710
   ->  Hash Semi Join  (cost=11910785.57..11913128.67 rows=1062 width=51) (actual time=27613.435..27672.574 rows=1770 loops=1)
         Hash Cond: (supplier.s_suppkey = partsupp.ps_suppkey)
         Buffers: shared hit=2697435 read=417609 dirtied=5557 written=13710
         ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=55) (actual time=5.835..55.300 rows=3988 loops=1)
               Buffers: shared hit=1838 read=14 written=1
               ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.028..0.039 rows=1 loops=1)
                     Filter: (n_name = 'CHINA'::bpchar)
                     Rows Removed by Filter: 24
                     Buffers: shared hit=1
               ->  Bitmap Heap Scan on supplier  (cost=79.26..2350.26 rows=4000 width=59) (actual time=5.794..53.467 rows=3988 loops=1)
                     Recheck Cond: (s_nationkey = nation.n_nationkey)
                     Buffers: shared hit=1837 read=14 written=1
                     ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.26 rows=4000 width=0) (actual time=5.399..5.399 rows=3988 loops=1)
                           Index Cond: (s_nationkey = nation.n_nationkey)
                           Buffers: shared read=14 written=1
         ->  Hash  (cost=11910374.32..11910374.32 rows=26559 width=4) (actual time=27607.524..27607.524 rows=44838 loops=1)
               Buckets: 4096  Batches: 1  Memory Usage: 1577kB
               Buffers: shared hit=2695597 read=417595 dirtied=5557 written=13709
               ->  HashAggregate  (cost=11909843.14..11910108.73 rows=26559 width=4) (actual time=27564.790..27590.612 rows=44838 loops=1)
                     Buffers: shared hit=2695597 read=417595 dirtied=5557 written=13709
                     ->  Nested Loop  (cost=0.00..11909776.75 rows=26559 width=4) (actual time=1.344..27410.507 rows=59046 loops=1)
                           Buffers: shared hit=2695597 read=417595 dirtied=5557 written=13709
                           ->  Seq Scan on part  (cost=0.00..65522.00 rows=20020 width=4) (actual time=0.036..1672.363 rows=21725 loops=1)
                                 Filter: ((p_name)::text ~~ 'linen%'::text)
                                 Rows Removed by Filter: 1978275
                                 Buffers: shared hit=8699 read=31823 written=1176
                           ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..591.61 rows=1 width=8) (actual time=0.855..1.181 rows=3 loops=21725)
                                 Index Cond: (ps_partkey = part.p_partkey)
                                 Filter: ((ps_availqty)::double precision > (SubPlan 1))
                                 Rows Removed by Filter: 1
                                 Buffers: shared hit=2686898 read=385772 dirtied=5557 written=12533
                                 SubPlan 1
                                   ->  Aggregate  (cost=144.95..144.96 rows=1 width=4) (actual time=0.278..0.279 rows=1 loops=86900)
                                         Buffers: shared hit=2616498 read=366482 dirtied=5557 written=12111
                                         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..144.94 rows=1 width=4) (actual time=0.176..0.275 rows=1 loops=86900)
                                               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=2616498 read=366482 dirtied=5557 written=12111
 Total runtime: 27709.515 ms
(44 rows)

COMMIT;
COMMIT