BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	o_orderpriority,
	count(*) as order_count
from
	orders
where
	o_orderdate >= date '1994-08-01'
	and o_orderdate < cast(date '1994-08-01' + 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=1285723.64..1285723.65 rows=1 width=16) (actual time=62535.814..62535.814 rows=5 loops=1)
   Sort Key: orders.o_orderpriority
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=343169 read=1151471
   ->  HashAggregate  (cost=1285723.62..1285723.63 rows=1 width=16) (actual time=62535.643..62535.647 rows=5 loops=1)
         Buffers: shared hit=343164 read=1151471
         ->  Hash Join  (cost=1017386.44..1284963.28 rows=152068 width=16) (actual time=51395.846..62363.871 rows=525903 loops=1)
               Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
               Buffers: shared hit=343164 read=1151471
               ->  Bitmap Heap Scan on orders  (cost=12100.91..274179.51 rows=570440 width=20) (actual time=197.661..1431.591 rows=573736 loops=1)
                     Recheck Cond: ((o_orderdate >= '1994-08-01'::date) AND (o_orderdate < '1994-11-01'::date))
                     Buffers: shared hit=202087 read=27861
                     ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..11958.30 rows=570440 width=0) (actual time=137.532..137.532 rows=573736 loops=1)
                           Index Cond: ((o_orderdate >= '1994-08-01'::date) AND (o_orderdate < '1994-11-01'::date))
                           Buffers: shared read=1570
               ->  Hash  (cost=988607.65..988607.65 rows=1334231 width=4) (actual time=51196.078..51196.078 rows=13767196 loops=1)
                     Buckets: 262144  Batches: 1  Memory Usage: 484003kB
                     Buffers: shared hit=141077 read=1123610
                     ->  HashAggregate  (cost=975265.34..988607.65 rows=1334231 width=4) (actual time=36699.640..46509.780 rows=13767196 loops=1)
                           Buffers: shared hit=141077 read=1123610
                           ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem  (cost=0.00..925227.10 rows=20015296 width=4) (actual time=0.121..16410.617 rows=37967116 loops=1)
                                 Buffers: shared hit=141077 read=1123610
 Total runtime: 62782.519 ms
(23 rows)

COMMIT;
COMMIT