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 '1995-03-07'
	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=2670572.68..2670572.70 rows=10 width=20) (actual time=32702.595..32702.599 rows=10 loops=1)
   Buffers: shared hit=766068 read=591690 dirtied=1 written=1
   ->  Sort  (cost=2670572.68..2678439.62 rows=3146776 width=20) (actual time=32702.591..32702.593 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=766068 read=591690 dirtied=1 written=1
         ->  HashAggregate  (cost=2571104.22..2602571.98 rows=3146776 width=20) (actual time=32635.349..32682.704 rows=114055 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=766062 read=591690 dirtied=1 written=1
               ->  Hash Join  (cost=551131.03..2523902.58 rows=3146776 width=20) (actual time=9395.954..32227.059 rows=301858 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=766062 read=591690 dirtied=1 written=1
                     ->  Seq Scan on lineitem  (cost=0.00..1818872.36 rows=32648380 width=12) (actual time=0.039..16572.624 rows=32566070 loops=1)
                           Filter: (l_shipdate > '1995-03-07'::date)
                           Rows Removed by Filter: 27479533
                           Buffers: shared hit=477259 read=590287 dirtied=1 written=1
                     ->  Hash  (cost=533022.96..533022.96 rows=1448646 width=12) (actual time=9367.116..9367.116 rows=1453282 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78830kB
                           Buffers: shared hit=288803 read=1403
                           ->  Hash Join  (cost=49735.19..533022.96 rows=1448646 width=12) (actual time=473.992..8776.747 rows=1453282 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=288803 read=1403
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7240454 width=16) (actual time=0.039..4310.845 rows=7246881 loops=1)
                                       Filter: (o_orderdate < '1995-03-07'::date)
                                       Rows Removed by Filter: 7768119
                                       Buffers: shared hit=253537 read=238
                                 ->  Hash  (cost=45983.76..45983.76 rows=300115 width=4) (actual time=469.034..469.034 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=35266 read=1165
                                       ->  Bitmap Heap Scan on customer  (cost=6954.32..45983.76 rows=300115 width=4) (actual time=88.421..365.631 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=35266 read=1165
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6879.29 rows=300115 width=0) (actual time=74.597..74.597 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 2.976 ms
 Execution time: 32737.529 ms
(38 rows)

COMMIT;
COMMIT