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=1972445.62..1972445.63 rows=1 width=26) (actual time=48208.306..48208.324 rows=100 loops=1)
   Buffers: shared hit=13611745 read=789755 dirtied=1270 written=9855
   ->  Sort  (cost=1972445.62..1972445.63 rows=1 width=26) (actual time=48208.304..48208.311 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=13611745 read=789755 dirtied=1270 written=9855
         ->  HashAggregate  (cost=1972445.60..1972445.61 rows=1 width=26) (actual time=48204.924..48206.995 rows=3945 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=13611737 read=789755 dirtied=1270 written=9855
               ->  Nested Loop Anti Join  (cost=2443.74..1972445.60 rows=1 width=26) (actual time=19.316..48110.653 rows=38988 loops=1)
                     Buffers: shared hit=13611737 read=789755 dirtied=1270 written=9855
                     ->  Nested Loop Semi Join  (cost=2443.17..1972444.29 rows=1 width=34) (actual time=15.775..45129.893 rows=697457 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10118206 read=787836 dirtied=1268 written=9831
                           ->  Nested Loop  (cost=2442.61..1446440.18 rows=393617 width=38) (actual time=15.696..39515.752 rows=723618 loops=1)
                                 Buffers: shared hit=6655132 read=627220 dirtied=1266 written=8203
                                 ->  Hash Join  (cost=2442.17..1020732.76 rows=808586 width=34) (actual time=15.668..30310.064 rows=1496407 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=726235 read=562405 dirtied=1038 written=7507
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..934398.87 rows=20215046 width=8) (actual time=0.092..20030.124 rows=37965800 loops=1)
                                             Buffers: shared hit=724389 read=562392 dirtied=1038 written=7507
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=15.532..15.532 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=1.171..14.437 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=0.009..0.015 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=1.156..13.678 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=0.876..0.876 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=0.005..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=5928897 read=64815 dirtied=228 written=696
                           ->  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=723618)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3463074 read=160616 dirtied=2 written=1628
                     ->  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=3493531 read=1919 dirtied=2 written=24
 Planning time: 10.498 ms
 Execution time: 48208.708 ms
(54 rows)

COMMIT;
COMMIT