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 '1995-03-18'
	and l_shipdate > date '1995-03-18'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2759432.06..2759432.08 rows=10 width=20) (actual time=81643.487..81643.492 rows=10 loops=1)
   Buffers: shared hit=956296 read=410660 written=6
   ->  Sort  (cost=2759432.06..2767268.64 rows=3134632 width=20) (actual time=81643.482..81643.486 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=956296 read=410660 written=6
         ->  HashAggregate  (cost=2660347.47..2691693.79 rows=3134632 width=20) (actual time=81546.634..81621.715 rows=113254 loops=1)
               Buffers: shared hit=956290 read=410660 written=6
               ->  Hash Join  (cost=628489.34..2613327.99 rows=3134632 width=20) (actual time=25875.974..81009.719 rows=298547 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=956290 read=410660 written=6
                     ->  Seq Scan on lineitem  (cost=0.00..1831527.38 rows=32523987 width=12) (actual time=0.068..32701.579 rows=32256117 loops=1)
                           Filter: (l_shipdate > '1995-03-18'::date)
                           Rows Removed by Filter: 27727805
                           Buffers: shared hit=702690 read=372286
                     ->  Hash  (cost=610255.65..610255.65 rows=1458695 width=12) (actual time=25872.419..25872.419 rows=1462150 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62827kB
                           Buffers: shared hit=253600 read=38374 written=6
                           ->  Hash Join  (cost=49575.50..610255.65 rows=1458695 width=12) (actual time=1141.360..25038.377 rows=1462150 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=253600 read=38374 written=6
                                 ->  Seq Scan on orders  (cost=0.00..444735.19 rows=7371492 width=16) (actual time=0.021..6901.989 rows=7308802 loops=1)
                                       Filter: (o_orderdate < '1995-03-18'::date)
                                       Rows Removed by Filter: 7691198
                                       Buffers: shared hit=253598 read=1950 written=6
                                 ->  Hash  (cost=45865.19..45865.19 rows=296825 width=4) (actual time=1141.044..1141.044 rows=299496 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10530kB
                                       Buffers: shared hit=2 read=36424
                                       ->  Bitmap Heap Scan on customer  (cost=6876.87..45865.19 rows=296825 width=4) (actual time=119.436..988.147 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Buffers: shared hit=2 read=36424
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6802.67 rows=296825 width=0) (actual time=106.021..106.021 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1151
 Total runtime: 81685.923 ms
(35 rows)

COMMIT;
COMMIT