BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	o_orderpriority,
	count(*) as order_count
from
	orders
where
	o_orderdate >= date '1995-02-01'
	and o_orderdate < cast(date '1995-02-01' + interval '3 month' as date)
	and exists (
		select
			*
		from
			lineitem
		where
			l_orderkey = o_orderkey
			and l_commitdate < l_receiptdate
	)
group by
	o_orderpriority
order by
	o_orderpriority;
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=1291764.91..1291764.91 rows=1 width=16) (actual time=104964.516..104964.516 rows=5 loops=1)
   Sort Key: orders.o_orderpriority
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1394195 read=119445 written=74
   ->  HashAggregate  (cost=1291764.89..1291764.90 rows=1 width=16) (actual time=104964.343..104964.345 rows=5 loops=1)
         Buffers: shared hit=1394190 read=119445 written=74
         ->  Hash Join  (cost=1022341.10..1291019.11 rows=149155 width=16) (actual time=90055.491..104602.692 rows=509268 loops=1)
               Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
               Buffers: shared hit=1394190 read=119445 written=74
               ->  Bitmap Heap Scan on orders  (cost=12030.42..275276.68 rows=563951 width=20) (actual time=638.579..4202.477 rows=555223 loops=1)
                     Recheck Cond: ((o_orderdate >= '1995-02-01'::date) AND (o_orderdate < '1995-05-01'::date))
                     Buffers: shared hit=226380 read=2429 written=74
                     ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..11889.43 rows=563951 width=0) (actual time=539.178..539.178 rows=558019 loops=1)
                           Index Cond: ((o_orderdate >= '1995-02-01'::date) AND (o_orderdate < '1995-05-01'::date))
                           Buffers: shared hit=1 read=1543
               ->  Hash  (cost=993681.48..993681.48 rows=1330336 width=4) (actual time=89414.911..89414.911 rows=13767164 loops=1)
                     Buckets: 262144  Batches: 1  Memory Usage: 484002kB
                     Buffers: shared hit=1167810 read=117016
                     ->  HashAggregate  (cost=980378.12..993681.48 rows=1330336 width=4) (actual time=74758.824..85176.566 rows=13767164 loops=1)
                           Buffers: shared hit=1167810 read=117016
                           ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem  (cost=0.00..930090.53 rows=20115033 width=4) (actual time=0.237..37532.302 rows=37966560 loops=1)
                                 Buffers: shared hit=1167810 read=117016
 Total runtime: 105319.287 ms
(23 rows)

COMMIT;
COMMIT