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 '1995-03-25'
	and l_shipdate > date '1995-03-25'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2741547.02..2741547.05 rows=10 width=20) (actual time=43585.580..43585.585 rows=10 loops=1)
   Buffers: shared hit=838725 read=517704
   ->  Sort  (cost=2741547.02..2749426.95 rows=3151970 width=20) (actual time=43585.564..43585.567 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=838725 read=517704
         ->  HashAggregate  (cost=2641914.38..2673434.08 rows=3151970 width=20) (actual time=43508.886..43567.134 rows=113318 loops=1)
               Buffers: shared hit=838719 read=517704
               ->  Hash Join  (cost=625483.63..2594634.83 rows=3151970 width=20) (actual time=10441.013..43269.801 rows=299180 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=838719 read=517704
                     ->  Seq Scan on lineitem  (cost=0.00..1817039.80 rows=32157787 width=12) (actual time=0.036..17730.932 rows=32116126 loops=1)
                           Filter: (l_shipdate > '1995-03-25'::date)
                           Rows Removed by Filter: 27929543
                           Buffers: shared hit=549922 read=516553
                     ->  Hash  (cost=607087.32..607087.32 rows=1471705 width=12) (actual time=10438.135..10438.135 rows=1472374 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63267kB
                           Buffers: shared hit=288797 read=1151
                           ->  Hash Join  (cost=49686.99..607087.32 rows=1471705 width=12) (actual time=406.935..9973.109 rows=1472374 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=288797 read=1151
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7379926 width=16) (actual time=0.021..4282.584 rows=7359337 loops=1)
                                       Filter: (o_orderdate < '1995-03-25'::date)
                                       Rows Removed by Filter: 7655663
                                       Buffers: shared hit=253522
                                 ->  Hash  (cost=45947.86..45947.86 rows=299130 width=4) (actual time=406.672..406.672 rows=299496 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10530kB
                                       Buffers: shared hit=35275 read=1151
                                       ->  Bitmap Heap Scan on customer  (cost=6930.74..45947.86 rows=299130 width=4) (actual time=68.097..337.870 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Buffers: shared hit=35275 read=1151
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6855.96 rows=299130 width=0) (actual time=59.613..59.613 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1151
 Total runtime: 43623.276 ms
(35 rows)

COMMIT;
COMMIT