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 '1995-03-23'
	and l_shipdate > date '1995-03-23'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2698029.93..2698029.96 rows=10 width=20) (actual time=38165.977..38165.979 rows=10 loops=1)
   Buffers: shared hit=746165 read=624766 dirtied=156 written=110
   ->  Sort  (cost=2698029.93..2706048.71 rows=3207511 width=20) (actual time=38165.972..38165.973 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=746165 read=624766 dirtied=156 written=110
         ->  HashAggregate  (cost=2596641.66..2628716.77 rows=3207511 width=20) (actual time=38069.137..38144.318 rows=113526 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=746159 read=624766 dirtied=156 written=110
               ->  Hash Join  (cost=557298.18..2548529.00 rows=3207511 width=20) (actual time=9919.603..37439.253 rows=300577 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=746159 read=624766 dirtied=156 written=110
                     ->  Seq Scan on lineitem  (cost=0.00..1837000.04 rows=32574846 width=12) (actual time=0.043..20879.831 rows=32164953 loops=1)
                           Filter: (l_shipdate > '1995-03-23'::date)
                           Rows Removed by Filter: 27880041
                           Buffers: shared hit=602951 read=475237 written=7
                     ->  Hash  (cost=538614.36..538614.36 rows=1494705 width=12) (actual time=9903.933..9903.933 rows=1469149 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79512kB
                           Buffers: shared hit=143208 read=149529 dirtied=156 written=103
                           ->  Hash Join  (cost=49885.86..538614.36 rows=1494705 width=12) (actual time=1044.577..9312.364 rows=1469149 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=143208 read=149529 dirtied=156 written=103
                                 ->  Seq Scan on orders  (cost=0.00..446056.09 rows=7393430 width=16) (actual time=0.034..5685.563 rows=7347115 loops=1)
                                       Filter: (o_orderdate < '1995-03-23'::date)
                                       Rows Removed by Filter: 7667885
                                       Buffers: shared hit=143206 read=113101 dirtied=156 written=68
                                 ->  Hash  (cost=46095.24..46095.24 rows=303250 width=4) (actual time=1040.196..1040.196 rows=300441 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14659kB
                                       Buffers: shared hit=2 read=36428 written=35
                                       ->  Bitmap Heap Scan on customer  (cost=7026.61..46095.24 rows=303250 width=4) (actual time=115.445..915.728 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Heap Blocks: exact=35276
                                             Buffers: shared hit=2 read=36428 written=35
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6950.80 rows=303250 width=0) (actual time=103.278..103.278 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1154 written=2
 Planning time: 6.616 ms
 Execution time: 38204.319 ms
(38 rows)

COMMIT;
COMMIT