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 '1995-03-01'
	and l_shipdate > date '1995-03-01'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2687816.16..2687816.19 rows=10 width=20) (actual time=34157.099..34157.104 rows=10 loops=1)
   Buffers: shared hit=905441 read=460208 dirtied=1 written=101
   ->  Sort  (cost=2687816.16..2695775.09 rows=3183572 width=20) (actual time=34157.097..34157.099 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=905441 read=460208 dirtied=1 written=101
         ->  HashAggregate  (cost=2587184.60..2619020.32 rows=3183572 width=20) (actual time=34049.605..34136.166 rows=113391 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=905435 read=460208 dirtied=1 written=101
               ->  Hash Join  (cost=554128.66..2539431.02 rows=3183572 width=20) (actual time=8970.516..33779.004 rows=299572 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=905435 read=460208 dirtied=1 written=101
                     ->  Seq Scan on lineitem  (cost=0.00..1829728.70 rows=32996783 width=12) (actual time=0.037..18697.404 rows=32714723 loops=1)
                           Filter: (l_shipdate > '1995-03-01'::date)
                           Rows Removed by Filter: 27329941
                           Buffers: shared hit=706044 read=367874 written=1
                     ->  Hash  (cost=535893.71..535893.71 rows=1458796 width=12) (actual time=8958.001..8958.001 rows=1441459 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78322kB
                           Buffers: shared hit=199391 read=92334 dirtied=1 written=100
                           ->  Hash Join  (cost=49803.99..535893.71 rows=1458796 width=12) (actual time=806.884..8396.580 rows=1441459 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=199391 read=92334 dirtied=1 written=100
                                 ->  Seq Scan on orders  (cost=0.00..444294.89 rows=7255166 width=16) (actual time=0.024..5109.910 rows=7209273 loops=1)
                                       Filter: (o_orderdate < '1995-03-01'::date)
                                       Rows Removed by Filter: 7805727
                                       Buffers: shared hit=199389 read=55906 dirtied=1 written=73
                                 ->  Hash  (cost=46033.93..46033.93 rows=301605 width=4) (actual time=804.078..804.078 rows=300441 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14659kB
                                       Buffers: shared hit=2 read=36428 written=27
                                       ->  Bitmap Heap Scan on customer  (cost=6985.87..46033.93 rows=301605 width=4) (actual time=75.500..709.774 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Heap Blocks: exact=35276
                                             Buffers: shared hit=2 read=36428 written=27
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6910.47 rows=301605 width=0) (actual time=66.421..66.421 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 4.766 ms
 Execution time: 34189.451 ms
(38 rows)

COMMIT;
COMMIT