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 '1995-03-06'
	and l_shipdate > date '1995-03-06'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2775525.83..2775525.85 rows=10 width=20) (actual time=84632.142..84632.146 rows=10 loops=1)
   Buffers: shared hit=902892 read=470672
   ->  Sort  (cost=2775525.83..2783500.88 rows=3190023 width=20) (actual time=84632.138..84632.138 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=902892 read=470672
         ->  HashAggregate  (cost=2674690.34..2706590.57 rows=3190023 width=20) (actual time=84546.792..84611.351 rows=113551 loops=1)
               Buffers: shared hit=902886 read=470672
               ->  Hash Join  (cost=630515.44..2626840.00 rows=3190023 width=20) (actual time=26167.480..84025.575 rows=299158 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=902886 read=470672
                     ->  Seq Scan on lineitem  (cost=0.00..1840630.19 rows=33011772 width=12) (actual time=0.057..32081.638 rows=32589917 loops=1)
                           Filter: (l_shipdate > '1995-03-06'::date)
                           Rows Removed by Filter: 27455116
                           Buffers: shared hit=609647 read=470672
                     ->  Hash  (cost=612143.24..612143.24 rows=1469776 width=12) (actual time=26165.326..26165.326 rows=1448632 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62246kB
                           Buffers: shared hit=293239
                           ->  Hash Join  (cost=49773.94..612143.24 rows=1469776 width=12) (actual time=792.377..24487.924 rows=1448632 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=293239
                                 ->  Seq Scan on orders  (cost=0.00..446936.69 rows=7326171 width=16) (actual time=0.025..6669.690 rows=7240737 loops=1)
                                       Filter: (o_orderdate < '1995-03-06'::date)
                                       Rows Removed by Filter: 7774263
                                       Buffers: shared hit=256813
                                 ->  Hash  (cost=46012.31..46012.31 rows=300930 width=4) (actual time=792.021..792.021 rows=299496 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10530kB
                                       Buffers: shared hit=36426
                                       ->  Bitmap Heap Scan on customer  (cost=6972.69..46012.31 rows=300930 width=4) (actual time=99.741..648.848 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Buffers: shared hit=36426
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6897.46 rows=300930 width=0) (actual time=87.249..87.249 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared hit=1151
 Total runtime: 84676.668 ms
(35 rows)

COMMIT;
COMMIT