BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	l_orderkey,
	sum(l_extendedprice * (1 - l_discount)) as revenue,
	o_orderdate,
	o_shippriority
from
	customer,
	orders,
	lineitem
where
	c_mktsegment = 'FURNITURE'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-31'
	and l_shipdate > date '1995-03-31'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2685160.89..2685160.92 rows=10 width=20) (actual time=36241.781..36241.784 rows=10 loops=1)
   Buffers: shared hit=766800 read=599629 written=3746
   ->  Sort  (cost=2685160.89..2693030.18 rows=3147716 width=20) (actual time=36241.777..36241.778 rows=10 loops=1)
         Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))), orders.o_orderdate
         Sort Method: top-N heapsort  Memory: 25kB
         Buffers: shared hit=766800 read=599629 written=3746
         ->  HashAggregate  (cost=2585662.72..2617139.88 rows=3147716 width=20) (actual time=36169.090..36220.204 rows=113243 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=766794 read=599629 written=3746
               ->  Hash Join  (cost=554960.84..2538446.98 rows=3147716 width=20) (actual time=10011.650..35859.525 rows=298877 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=766794 read=599629 written=3746
                     ->  Seq Scan on lineitem  (cost=0.00..1831062.34 rows=32252438 width=12) (actual time=0.041..20057.653 rows=31932232 loops=1)
                           Filter: (l_shipdate > '1995-03-31'::date)
                           Rows Removed by Filter: 28052287
                           Buffers: shared hit=631719 read=442984 written=1
                     ->  Hash  (cost=536515.17..536515.17 rows=1475654 width=12) (actual time=9896.563..9896.563 rows=1478444 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79911kB
                           Buffers: shared hit=135075 read=156645 written=3745
                           ->  Hash Join  (cost=49659.45..536515.17 rows=1475654 width=12) (actual time=920.332..9282.679 rows=1478444 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=135075 read=156645 written=3745
                                 ->  Seq Scan on orders  (cost=0.00..444294.89 rows=7414477 width=16) (actual time=0.045..5725.360 rows=7389375 loops=1)
                                       Filter: (o_orderdate < '1995-03-31'::date)
                                       Rows Removed by Filter: 7610625
                                       Buffers: shared hit=135073 read=120222 written=1365
                                 ->  Hash  (cost=45927.76..45927.76 rows=298535 width=4) (actual time=916.069..916.069 rows=299496 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14626kB
                                       Buffers: shared hit=2 read=36423 written=2380
                                       ->  Bitmap Heap Scan on customer  (cost=6918.07..45927.76 rows=298535 width=4) (actual time=100.322..815.197 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36423 written=2380
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6843.44 rows=298535 width=0) (actual time=90.896..90.896 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1150 written=56
 Planning time: 4.767 ms
 Execution time: 36706.258 ms
(38 rows)

COMMIT;
COMMIT