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 = 'BUILDING'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-14'
	and l_shipdate > date '1995-03-14'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2698465.05..2698465.07 rows=10 width=20) (actual time=34553.220..34553.224 rows=10 loops=1)
   Buffers: shared hit=825663 read=546596 dirtied=45 written=4176
   ->  Sort  (cost=2698465.05..2706403.22 rows=3175268 width=20) (actual time=34553.217..34553.219 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=825663 read=546596 dirtied=45 written=4176
         ->  HashAggregate  (cost=2598095.97..2629848.65 rows=3175268 width=20) (actual time=34474.445..34532.844 rows=114177 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=825657 read=546596 dirtied=45 written=4176
               ->  Hash Join  (cost=557029.81..2550466.95 rows=3175268 width=20) (actual time=9394.805..34216.149 rows=302557 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=825657 read=546596 dirtied=45 written=4176
                     ->  Seq Scan on lineitem  (cost=0.00..1838834.20 rows=32760070 width=12) (actual time=0.051..18112.120 rows=32390055 loops=1)
                           Filter: (l_shipdate > '1995-03-14'::date)
                           Rows Removed by Filter: 27655242
                           Buffers: shared hit=598847 read=480415
                     ->  Hash  (cost=538620.23..538620.23 rows=1472766 width=12) (actual time=9376.562..9376.562 rows=1462004 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79205kB
                           Buffers: shared hit=226810 read=66181 dirtied=45 written=4176
                           ->  Hash Join  (cost=49672.78..538620.23 rows=1472766 width=12) (actual time=857.609..8727.969 rows=1462004 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=226810 read=66181 dirtied=45 written=4176
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7392907 width=16) (actual time=0.026..4889.366 rows=7290782 loops=1)
                                       Filter: (o_orderdate < '1995-03-14'::date)
                                       Rows Removed by Filter: 7724218
                                       Buffers: shared hit=226808 read=29752 dirtied=45 written=243
                                 ->  Hash  (cost=45937.53..45937.53 rows=298820 width=4) (actual time=853.322..853.322 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=2 read=36429 written=3933
                                       ->  Bitmap Heap Scan on customer  (cost=6924.28..45937.53 rows=298820 width=4) (actual time=76.724..742.617 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=2 read=36429 written=3933
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6849.58 rows=298820 width=0) (actual time=67.996..67.996 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154 written=144
 Planning time: 4.047 ms
 Execution time: 34578.969 ms
(38 rows)

COMMIT;
COMMIT