BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	o_orderpriority,
	count(*) as order_count
from
	orders
where
	o_orderdate >= date '1997-09-01'
	and o_orderdate < cast(date '1997-09-01' + 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=1294694.02..1294694.03 rows=1 width=16) (actual time=83809.118..83809.119 rows=5 loops=1)
   Sort Key: orders.o_orderpriority
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=577658 read=935893 written=16464
   ->  HashAggregate  (cost=1294694.00..1294694.01 rows=1 width=16) (actual time=83808.964..83808.965 rows=5 loops=1)
         Buffers: shared hit=577653 read=935893 written=16464
         ->  Hash Join  (cost=1024660.83..1293928.40 rows=153121 width=16) (actual time=73543.443..83561.230 rows=519671 loops=1)
               Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
               Buffers: shared hit=577653 read=935893 written=16464
               ->  Bitmap Heap Scan on orders  (cost=12283.96..276081.38 rows=566828 width=20) (actual time=500.821..2102.053 rows=567035 loops=1)
                     Recheck Cond: ((o_orderdate >= '1997-09-01'::date) AND (o_orderdate < '1997-12-01'::date))
                     Buffers: shared hit=229066 read=1644
                     ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..12142.26 rows=566828 width=0) (actual time=399.238..399.238 rows=570857 loops=1)
                           Index Cond: ((o_orderdate >= '1997-09-01'::date) AND (o_orderdate < '1997-12-01'::date))
                           Buffers: shared read=1629
               ->  Hash  (cost=995358.29..995358.29 rows=1361486 width=4) (actual time=73040.700..73040.700 rows=13767175 loops=1)
                     Buckets: 262144  Batches: 1  Memory Usage: 484003kB
                     Buffers: shared hit=348587 read=934249 written=16464
                     ->  HashAggregate  (cost=981743.43..995358.29 rows=1361486 width=4) (actual time=58180.408..68209.783 rows=13767175 loops=1)
                           Buffers: shared hit=348587 read=934249 written=16464
                           ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem  (cost=0.00..931356.56 rows=20154748 width=4) (actual time=0.180..25507.352 rows=37965693 loops=1)
                                 Buffers: shared hit=348587 read=934249 written=16464
 Total runtime: 84122.045 ms
(23 rows)

COMMIT;
COMMIT