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 '1995-03-07'
	and l_shipdate > date '1995-03-07'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2671844.24..2671844.27 rows=10 width=20) (actual time=39986.786..39986.790 rows=10 loops=1)
   Buffers: shared hit=872662 read=485090 dirtied=774 written=768
   ->  Sort  (cost=2671844.24..2679748.70 rows=3161784 width=20) (actual time=39986.781..39986.782 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=872662 read=485090 dirtied=774 written=768
         ->  HashAggregate  (cost=2571901.38..2603519.22 rows=3161784 width=20) (actual time=39907.742..39966.364 rows=113585 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=872656 read=485090 dirtied=774 written=768
               ->  Hash Join  (cost=551265.22..2524474.62 rows=3161784 width=20) (actual time=11461.940..39592.091 rows=298936 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=872656 read=485090 dirtied=774 written=768
                     ->  Seq Scan on lineitem  (cost=0.00..1818870.86 rows=32725520 width=12) (actual time=0.048..19627.257 rows=32566070 loops=1)
                           Filter: (l_shipdate > '1995-03-07'::date)
                           Rows Removed by Filter: 27479533
                           Buffers: shared hit=676871 read=390675 dirtied=774 written=758
                     ->  Hash  (cost=533113.67..533113.67 rows=1452124 width=12) (actual time=11441.045..11441.045 rows=1449910 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78685kB
                           Buffers: shared hit=195785 read=94415 written=10
                           ->  Hash Join  (cost=49740.43..533113.67 rows=1452124 width=12) (actual time=917.279..10682.328 rows=1449910 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=195785 read=94415 written=10
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7253973 width=16) (actual time=0.039..5360.610 rows=7246881 loops=1)
                                       Filter: (o_orderdate < '1995-03-07'::date)
                                       Rows Removed by Filter: 7768119
                                       Buffers: shared hit=195783 read=57992 written=10
                                 ->  Hash  (cost=45987.00..45987.00 rows=300275 width=4) (actual time=912.159..912.159 rows=299496 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14626kB
                                       Buffers: shared hit=2 read=36423
                                       ->  Bitmap Heap Scan on customer  (cost=6955.56..45987.00 rows=300275 width=4) (actual time=88.355..782.526 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36423
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6880.49 rows=300275 width=0) (actual time=76.571..76.571 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1150
 Planning time: 4.788 ms
 Execution time: 40024.118 ms
(38 rows)

COMMIT;
COMMIT