BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	s_name,
	count(*) as numwait
from
	supplier,
	lineitem l1,
	orders,
	nation
where
	s_suppkey = l1.l_suppkey
	and o_orderkey = l1.l_orderkey
	and o_orderstatus = 'F'
	and l1.l_receiptdate > l1.l_commitdate
	and exists (
		select
			*
		from
			lineitem l2
		where
			l2.l_orderkey = l1.l_orderkey
			and l2.l_suppkey <> l1.l_suppkey
	)
	and not exists (
		select
			*
		from
			lineitem l3
		where
			l3.l_orderkey = l1.l_orderkey
			and l3.l_suppkey <> l1.l_suppkey
			and l3.l_receiptdate > l3.l_commitdate
	)
	and s_nationkey = n_nationkey
	and n_name = 'IRAQ'
group by
	s_name
order by
	numwait desc,
	s_name
LIMIT 100;
                                                                                                 QUERY PLAN                                                                                                 
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=1974672.62..1974672.62 rows=1 width=26) (actual time=39223.385..39223.405 rows=100 loops=1)
   Buffers: shared hit=14069805 read=839032 dirtied=334 written=9155
   ->  Sort  (cost=1974672.62..1974672.62 rows=1 width=26) (actual time=39223.380..39223.383 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=14069805 read=839032 dirtied=334 written=9155
         ->  HashAggregate  (cost=1974672.60..1974672.61 rows=1 width=26) (actual time=39220.522..39222.225 rows=4095 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=14069797 read=839032 dirtied=334 written=9155
               ->  Nested Loop Anti Join  (cost=2443.74..1974672.59 rows=1 width=26) (actual time=15.394..39145.622 rows=40936 loops=1)
                     Buffers: shared hit=14069797 read=839032 dirtied=334 written=9155
                     ->  Nested Loop Semi Join  (cost=2443.17..1974671.29 rows=1 width=34) (actual time=15.374..36542.194 rows=723982 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10443283 read=837036 dirtied=334 written=9136
                           ->  Nested Loop  (cost=2442.61..1449047.69 rows=393315 width=38) (actual time=15.319..31658.251 rows=751353 loops=1)
                                 Buffers: shared hit=6835799 read=682077 dirtied=334 written=8398
                                 ->  Hash Join  (cost=2442.17..1022902.94 rows=809395 width=34) (actual time=15.168..23926.545 rows=1554216 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=732167 read=560490 dirtied=334 written=6073
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..936408.47 rows=20255709 width=8) (actual time=0.085..16527.936 rows=37928434 loops=1)
                                             Buffers: shared hit=730326 read=560478 dirtied=334 written=6073
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=15.004..15.004 rows=4095 loops=1)
                                             Buckets: 4096  Batches: 1  Memory Usage: 288kB
                                             Buffers: shared hit=1838 read=12
                                             ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=30) (actual time=1.268..13.966 rows=4095 loops=1)
                                                   Buffers: shared hit=1838 read=12
                                                   ->  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 = 'IRAQ'::bpchar)
                                                         Rows Removed by Filter: 24
                                                         Buffers: shared hit=1
                                                   ->  Bitmap Heap Scan on supplier  (cost=79.29..2350.29 rows=4000 width=34) (actual time=1.248..13.117 rows=4095 loops=1)
                                                         Recheck Cond: (s_nationkey = nation.n_nationkey)
                                                         Heap Blocks: exact=1836
                                                         Buffers: shared hit=1837 read=12
                                                         ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.926..0.926 rows=4095 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared hit=1 read=12
                                 ->  Index Scan using pk_orders on orders  (cost=0.43..0.52 rows=1 width=4) (actual time=0.004..0.004 rows=0 loops=1554216)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=6103632 read=121587 written=2325
                           ->  Index Scan using pk_lineitem on lineitem l2  (cost=0.56..1.15 rows=15 width=8) (actual time=0.006..0.006 rows=1 loops=751353)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3607484 read=154959 written=738
                     ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l3  (cost=0.56..0.91 rows=5 width=8) (actual time=0.003..0.003 rows=1 loops=723982)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: (l_suppkey <> l1.l_suppkey)
                           Rows Removed by Filter: 0
                           Buffers: shared hit=3626514 read=1996 written=19
 Planning time: 10.336 ms
 Execution time: 39223.843 ms
(54 rows)

COMMIT;
COMMIT