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=1970318.32..1970318.32 rows=1 width=26) (actual time=50785.421..50785.440 rows=100 loops=1)
   Buffers: shared hit=13583847 read=818178 dirtied=25 written=7586
   ->  Sort  (cost=1970318.32..1970318.32 rows=1 width=26) (actual time=50785.417..50785.425 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=13583847 read=818178 dirtied=25 written=7586
         ->  HashAggregate  (cost=1970318.30..1970318.31 rows=1 width=26) (actual time=50782.004..50784.123 rows=3945 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=13583839 read=818178 dirtied=25 written=7586
               ->  Nested Loop Anti Join  (cost=2443.74..1970318.29 rows=1 width=26) (actual time=28.998..50700.430 rows=38988 loops=1)
                     Buffers: shared hit=13583839 read=818178 dirtied=25 written=7586
                     ->  Nested Loop Semi Join  (cost=2443.17..1970316.98 rows=1 width=34) (actual time=23.993..47344.049 rows=697457 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10090388 read=816179 dirtied=25 written=7567
                           ->  Nested Loop  (cost=2442.61..1446228.69 rows=392183 width=38) (actual time=23.956..41500.227 rows=723618 loops=1)
                                 Buffers: shared hit=6601321 read=681031 dirtied=25 written=6457
                                 ->  Hash Join  (cost=2442.17..1020514.71 rows=808598 width=34) (actual time=23.925..31764.670 rows=1496407 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=632521 read=656119 written=6409
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..934181.08 rows=20214944 width=8) (actual time=0.125..21680.884 rows=37965800 loops=1)
                                             Buffers: shared hit=630675 read=656106 written=6409
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=23.726..23.726 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=1.723..21.663 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..0.021 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=1.701..20.169 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=1.334..1.334 rows=3945 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=1496407)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=5968800 read=24912 dirtied=25 written=48
                           ->  Index Scan using lineitem_l_orderkey_idx on lineitem l2  (cost=0.56..1.15 rows=15 width=8) (actual time=0.007..0.007 rows=1 loops=723618)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3489067 read=135148 written=1110
                     ->  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=697457)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: (l_suppkey <> l1.l_suppkey)
                           Rows Removed by Filter: 0
                           Buffers: shared hit=3493451 read=1999 written=19
 Planning time: 16.128 ms
 Execution time: 50786.001 ms
(54 rows)

COMMIT;
COMMIT