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 '1995-03-05'
	and l_shipdate > date '1995-03-05'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2697939.03..2697939.05 rows=10 width=20) (actual time=35292.794..35292.798 rows=10 loops=1)
   Buffers: shared hit=745327 read=625599 dirtied=1 written=89
   ->  Sort  (cost=2697939.03..2705918.16 rows=3191652 width=20) (actual time=35292.790..35292.793 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=745327 read=625599 dirtied=1 written=89
         ->  HashAggregate  (cost=2597052.06..2628968.58 rows=3191652 width=20) (actual time=35210.070..35271.338 rows=113541 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=745321 read=625599 dirtied=1 written=89
               ->  Hash Join  (cost=556165.38..2549177.27 rows=3191652 width=20) (actual time=8846.600..34933.833 rows=299203 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=745321 read=625599 dirtied=1 written=89
                     ->  Seq Scan on lineitem  (cost=0.00..1837002.56 rows=33091417 width=12) (actual time=0.060..18636.567 rows=32614932 loops=1)
                           Filter: (l_shipdate > '1995-03-05'::date)
                           Rows Removed by Filter: 27430062
                           Buffers: shared hit=552408 read=525780 dirtied=1 written=1
                     ->  Hash  (cost=537864.17..537864.17 rows=1464097 width=12) (actual time=8835.250..8835.250 rows=1447458 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78580kB
                           Buffers: shared hit=192913 read=99819 written=88
                           ->  Hash Join  (cost=49740.43..537864.17 rows=1464097 width=12) (actual time=813.229..8341.246 rows=1447458 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=192913 read=99819 written=88
                                 ->  Seq Scan on orders  (cost=0.00..446056.09 rows=7313780 width=16) (actual time=0.025..5108.089 rows=7234387 loops=1)
                                       Filter: (o_orderdate < '1995-03-05'::date)
                                       Rows Removed by Filter: 7780613
                                       Buffers: shared hit=192911 read=63396 written=46
                                 ->  Hash  (cost=45987.00..45987.00 rows=300275 width=4) (actual time=810.049..810.049 rows=299496 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14626kB
                                       Buffers: shared hit=2 read=36423 written=42
                                       ->  Bitmap Heap Scan on customer  (cost=6955.56..45987.00 rows=300275 width=4) (actual time=79.158..716.786 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36423 written=42
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6880.49 rows=300275 width=0) (actual time=69.700..69.700 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1150 written=4
 Planning time: 4.224 ms
 Execution time: 35318.785 ms
(38 rows)

COMMIT;
COMMIT