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 = 'MACHINERY'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-08'
	and l_shipdate > date '1995-03-08'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2749389.78..2749389.81 rows=10 width=20) (actual time=77057.582..77057.587 rows=10 loops=1)
   Buffers: shared hit=649908 read=710476 dirtied=319 written=19
   ->  Sort  (cost=2749389.78..2757287.81 rows=3159212 width=20) (actual time=77057.576..77057.580 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=649908 read=710476 dirtied=319 written=19
         ->  HashAggregate  (cost=2649528.22..2681120.34 rows=3159212 width=20) (actual time=76956.738..77035.876 rows=113501 loops=1)
               Buffers: shared hit=649902 read=710476 dirtied=319 written=19
               ->  Hash Join  (cost=625543.86..2602140.04 rows=3159212 width=20) (actual time=27169.112..76490.985 rows=299803 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=649902 read=710476 dirtied=319 written=19
                     ->  Seq Scan on lineitem  (cost=0.00..1822475.46 rows=32674294 width=12) (actual time=0.053..27524.277 rows=32541017 loops=1)
                           Filter: (l_shipdate > '1995-03-08'::date)
                           Rows Removed by Filter: 27504286
                           Buffers: shared hit=479815 read=589851
                     ->  Hash  (cost=607342.42..607342.42 rows=1456115 width=12) (actual time=27166.463..27166.463 rows=1450181 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62313kB
                           Buffers: shared hit=170087 read=120625 dirtied=319 written=19
                           ->  Hash Join  (cost=49660.32..607342.42 rows=1456115 width=12) (actual time=1201.083..25909.532 rows=1450181 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=170087 read=120625 dirtied=319 written=19
                                 ->  Seq Scan on orders  (cost=0.00..442530.20 rows=7315691 width=16) (actual time=0.028..7002.972 rows=7253318 loops=1)
                                       Filter: (o_orderdate < '1995-03-08'::date)
                                       Rows Removed by Filter: 7761682
                                       Buffers: shared hit=170083 read=84198 dirtied=319 written=19
                                 ->  Hash  (cost=45928.32..45928.32 rows=298560 width=4) (actual time=1200.746..1200.746 rows=300441 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10563kB
                                       Buffers: shared hit=4 read=36427
                                       ->  Bitmap Heap Scan on customer  (cost=6918.32..45928.32 rows=298560 width=4) (actual time=105.122..1037.013 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Buffers: shared hit=4 read=36427
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6843.68 rows=298560 width=0) (actual time=95.349..95.349 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 77107.293 ms
(35 rows)

COMMIT;
COMMIT