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 = 'ALGERIA'
group by
	s_name
order by
	numwait desc,
	s_name
LIMIT 100;
                                                                                                 QUERY PLAN                                                                                                 
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=1954252.25..1954252.25 rows=1 width=26) (actual time=38886.676..38886.694 rows=100 loops=1)
   Buffers: shared hit=13147327 read=1187610
   ->  Sort  (cost=1954252.25..1954252.25 rows=1 width=26) (actual time=38886.673..38886.680 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=13147327 read=1187610
         ->  HashAggregate  (cost=1954252.23..1954252.24 rows=1 width=26) (actual time=38884.649..38885.601 rows=3934 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=13147319 read=1187610
               ->  Nested Loop Anti Join  (cost=2443.74..1954252.22 rows=1 width=26) (actual time=22.166..38837.427 rows=39144 loops=1)
                     Buffers: shared hit=13147319 read=1187610
                     ->  Nested Loop Semi Join  (cost=2443.17..1954250.91 rows=1 width=34) (actual time=22.091..36438.789 rows=694907 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=9667463 read=1184747
                           ->  Nested Loop  (cost=2442.61..1431875.14 rows=390981 width=38) (actual time=22.025..31930.960 rows=721194 loops=1)
                                 Buffers: shared hit=6220720 read=1020116
                                 ->  Hash Join  (cost=2442.17..1010431.90 rows=800611 width=34) (actual time=22.005..24249.988 rows=1491522 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=357115 read=909432
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..924926.90 rows=20015276 width=8) (actual time=0.096..17989.580 rows=37967116 loops=1)
                                             Buffers: shared hit=355266 read=909420
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=21.858..21.858 rows=3934 loops=1)
                                             Buckets: 4096  Batches: 1  Memory Usage: 278kB
                                             Buffers: shared hit=1846 read=12
                                             ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=30) (actual time=1.160..20.749 rows=3934 loops=1)
                                                   Buffers: shared hit=1846 read=12
                                                   ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.007..0.015 rows=1 loops=1)
                                                         Filter: (n_name = 'ALGERIA'::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=1.144..19.814 rows=3934 loops=1)
                                                         Recheck Cond: (s_nationkey = nation.n_nationkey)
                                                         Heap Blocks: exact=1845
                                                         Buffers: shared hit=1845 read=12
                                                         ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.829..0.829 rows=3934 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared read=12
                                 ->  Index Scan using pk_orders on orders  (cost=0.43..0.52 rows=1 width=4) (actual time=0.004..0.005 rows=0 loops=1491522)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=5863605 read=110684
                           ->  Index Scan using pk_lineitem on lineitem l2  (cost=0.56..1.15 rows=15 width=8) (actual time=0.005..0.005 rows=1 loops=721194)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3446743 read=164631
                     ->  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=694907)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: (l_suppkey <> l1.l_suppkey)
                           Rows Removed by Filter: 0
                           Buffers: shared hit=3479856 read=2863
 Planning time: 15.099 ms
 Execution time: 38887.032 ms
(54 rows)

COMMIT;
COMMIT