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=1974415.48..1974415.48 rows=1 width=26) (actual time=54138.546..54138.559 rows=100 loops=1)
   Buffers: shared hit=14079205 read=844959 dirtied=300 written=10100
   ->  Sort  (cost=1974415.48..1974415.48 rows=1 width=26) (actual time=54138.544..54138.554 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=14079205 read=844959 dirtied=300 written=10100
         ->  HashAggregate  (cost=1974415.46..1974415.47 rows=1 width=26) (actual time=54135.020..54137.294 rows=4095 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=14079197 read=844959 dirtied=300 written=10100
               ->  Nested Loop Anti Join  (cost=2443.74..1974415.45 rows=1 width=26) (actual time=16.983..54029.233 rows=40964 loops=1)
                     Buffers: shared hit=14079197 read=844959 dirtied=300 written=10100
                     ->  Nested Loop Semi Join  (cost=2443.17..1974414.15 rows=1 width=34) (actual time=16.968..50798.162 rows=724674 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10449389 read=842781 dirtied=300 written=10078
                           ->  Nested Loop  (cost=2442.61..1447878.15 rows=394007 width=38) (actual time=16.900..44368.416 rows=752078 loops=1)
                                 Buffers: shared hit=6848630 read=677459 dirtied=300 written=8393
                                 ->  Hash Join  (cost=2442.17..1021742.70 rows=809387 width=34) (actual time=16.739..33896.744 rows=1555794 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=716360 read=578168 dirtied=300 written=7007
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..935325.64 rows=20235090 width=8) (actual time=0.126..22726.871 rows=37966174 loops=1)
                                             Buffers: shared hit=714520 read=578155 dirtied=300 written=7007
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=16.527..16.527 rows=4095 loops=1)
                                             Buckets: 4096  Batches: 1  Memory Usage: 288kB
                                             Buffers: shared hit=1837 read=13
                                             ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=30) (actual time=1.312..15.365 rows=4095 loops=1)
                                                   Buffers: shared hit=1837 read=13
                                                   ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.012..0.021 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=1.293..14.557 rows=4095 loops=1)
                                                         Recheck Cond: (s_nationkey = nation.n_nationkey)
                                                         Heap Blocks: exact=1836
                                                         Buffers: shared hit=1836 read=13
                                                         ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.998..0.998 rows=4095 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared read=13
                                 ->  Index Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.43..0.52 rows=1 width=4) (actual time=0.006..0.006 rows=0 loops=1555794)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=6132270 read=99291 written=1386
                           ->  Index Scan using pk_lineitem on lineitem l2  (cost=0.56..1.15 rows=15 width=8) (actual time=0.007..0.007 rows=1 loops=752078)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3600759 read=165322 written=1685
                     ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l3  (cost=0.56..0.91 rows=5 width=8) (actual time=0.004..0.004 rows=1 loops=724674)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: (l_suppkey <> l1.l_suppkey)
                           Rows Removed by Filter: 0
                           Buffers: shared hit=3629808 read=2178 written=22
 Planning time: 10.647 ms
 Execution time: 54139.010 ms
(54 rows)

COMMIT;
COMMIT