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 = 'ETHIOPIA'
group by
	s_name
order by
	numwait desc,
	s_name
LIMIT 100;
                                                                                                 QUERY PLAN                                                                                                 
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=1974608.33..1974608.34 rows=1 width=26) (actual time=44985.053..44985.070 rows=100 loops=1)
   Buffers: shared hit=13605121 read=803001 dirtied=553 written=12532
   ->  Sort  (cost=1974608.33..1974608.34 rows=1 width=26) (actual time=44985.050..44985.055 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=13605121 read=803001 dirtied=553 written=12532
         ->  HashAggregate  (cost=1974608.31..1974608.32 rows=1 width=26) (actual time=44982.342..44983.966 rows=3945 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=13605113 read=803001 dirtied=553 written=12532
               ->  Nested Loop Anti Join  (cost=2443.74..1974608.31 rows=1 width=26) (actual time=16.665..44893.860 rows=38981 loops=1)
                     Buffers: shared hit=13605113 read=803001 dirtied=553 written=12532
                     ->  Nested Loop Semi Join  (cost=2443.17..1974607.00 rows=1 width=34) (actual time=13.644..42132.087 rows=697419 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10111789 read=801087 dirtied=553 written=12510
                           ->  Nested Loop  (cost=2442.61..1449001.69 rows=393302 width=38) (actual time=13.512..37014.175 rows=723575 loops=1)
                                 Buffers: shared hit=6646423 read=642980 dirtied=553 written=10942
                                 ->  Hash Join  (cost=2442.17..1022869.12 rows=809369 width=34) (actual time=13.465..28559.335 rows=1496360 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=767283 read=528607 dirtied=300 written=8269
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..936377.31 rows=20255071 width=8) (actual time=0.113..18655.468 rows=37966199 loops=1)
                                             Buffers: shared hit=765437 read=528594 dirtied=300 written=8269
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=13.282..13.282 rows=3945 loops=1)
                                             Buckets: 4096  Batches: 1  Memory Usage: 279kB
                                             Buffers: shared hit=1843 read=13
                                             ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=30) (actual time=1.234..12.155 rows=3945 loops=1)
                                                   Buffers: shared hit=1843 read=13
                                                   ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.011..0.023 rows=1 loops=1)
                                                         Filter: (n_name = 'ETHIOPIA'::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=1.216..11.315 rows=3945 loops=1)
                                                         Recheck Cond: (s_nationkey = nation.n_nationkey)
                                                         Heap Blocks: exact=1842
                                                         Buffers: shared hit=1842 read=13
                                                         ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.922..0.922 rows=3945 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared read=13
                                 ->  Index Scan using pk_orders on orders  (cost=0.43..0.52 rows=1 width=4) (actual time=0.005..0.005 rows=0 loops=1496360)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=5879140 read=114373 dirtied=253 written=2673
                           ->  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=723575)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3465366 read=158107 written=1568
                     ->  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=697419)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: (l_suppkey <> l1.l_suppkey)
                           Rows Removed by Filter: 0
                           Buffers: shared hit=3493324 read=1914 written=22
 Planning time: 10.595 ms
 Execution time: 44985.549 ms
(54 rows)

COMMIT;
COMMIT