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=2684429.60..2684429.62 rows=10 width=20) (actual time=39660.766..39660.770 rows=10 loops=1)
   Buffers: shared hit=779004 read=586640 dirtied=1 written=100
   ->  Sort  (cost=2684429.60..2692282.16 rows=3141023 width=20) (actual time=39660.761..39660.762 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=779004 read=586640 dirtied=1 written=100
         ->  HashAggregate  (cost=2585142.99..2616553.22 rows=3141023 width=20) (actual time=39587.077..39639.374 rows=113540 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=778998 read=586640 dirtied=1 written=100
               ->  Hash Join  (cost=553741.39..2538027.65 rows=3141023 width=20) (actual time=11892.713..39301.955 rows=298826 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=778998 read=586640 dirtied=1 written=100
                     ->  Seq Scan on lineitem  (cost=0.00..1829724.88 rows=32840308 width=12) (actual time=0.035..20293.409 rows=32564576 loops=1)
                           Filter: (l_shipdate > '1995-03-07'::date)
                           Rows Removed by Filter: 27480088
                           Buffers: shared hit=580947 read=492971 dirtied=1 written=4
                     ->  Hash  (cost=535664.42..535664.42 rows=1446157 width=12) (actual time=11873.626..11873.626 rows=1449930 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78686kB
                           Buffers: shared hit=198051 read=93669 written=96
                           ->  Hash Join  (cost=49659.45..535664.42 rows=1446157 width=12) (actual time=718.148..11097.561 rows=1449930 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=198051 read=93669 written=96
                                 ->  Seq Scan on orders  (cost=0.00..444294.89 rows=7266271 width=16) (actual time=0.029..6719.166 rows=7247062 loops=1)
                                       Filter: (o_orderdate < '1995-03-07'::date)
                                       Rows Removed by Filter: 7767938
                                       Buffers: shared hit=164654 read=90641 written=90
                                 ->  Hash  (cost=45927.76..45927.76 rows=298535 width=4) (actual time=713.844..713.844 rows=299496 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14626kB
                                       Buffers: shared hit=33397 read=3028 written=6
                                       ->  Bitmap Heap Scan on customer  (cost=6918.07..45927.76 rows=298535 width=4) (actual time=116.989..569.956 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=33397 read=3028 written=6
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6843.44 rows=298535 width=0) (actual time=104.320..104.320 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1150 written=5
 Planning time: 5.252 ms
 Execution time: 39691.233 ms
(38 rows)

COMMIT;
COMMIT