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 '1995-03-22'
	and l_shipdate > date '1995-03-22'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2748661.08..2748661.11 rows=10 width=20) (actual time=82953.338..82953.344 rows=10 loops=1)
   Buffers: shared hit=712111 read=648273 dirtied=355 written=1
   ->  Sort  (cost=2748661.08..2756548.64 rows=3155021 width=20) (actual time=82953.333..82953.337 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=712111 read=648273 dirtied=355 written=1
         ->  HashAggregate  (cost=2648932.00..2680482.21 rows=3155021 width=20) (actual time=82824.410..82919.413 rows=113469 loops=1)
               Buffers: shared hit=712105 read=648273 dirtied=355 written=1
               ->  Hash Join  (cost=626584.18..2601606.69 rows=3155021 width=20) (actual time=25503.024..82305.091 rows=300272 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=712105 read=648273 dirtied=355 written=1
                     ->  Seq Scan on lineitem  (cost=0.00..1822479.77 rows=32264672 width=12) (actual time=0.051..31752.075 rows=32190234 loops=1)
                           Filter: (l_shipdate > '1995-03-22'::date)
                           Rows Removed by Filter: 27855069
                           Buffers: shared hit=434783 read=634883 dirtied=1 written=1
                     ->  Hash  (cost=608176.12..608176.12 rows=1472645 width=12) (actual time=25500.708..25500.708 rows=1467800 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63070kB
                           Buffers: shared hit=277322 read=13390 dirtied=354
                           ->  Hash Join  (cost=49737.54..608176.12 rows=1472645 width=12) (actual time=787.347..24558.554 rows=1467800 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=277322 read=13390 dirtied=354
                                 ->  Seq Scan on orders  (cost=0.00..442530.20 rows=7358686 width=16) (actual time=0.025..6530.553 rows=7340892 loops=1)
                                       Filter: (o_orderdate < '1995-03-22'::date)
                                       Rows Removed by Filter: 7674108
                                       Buffers: shared hit=242050 read=12231 dirtied=354
                                 ->  Hash  (cost=45985.23..45985.23 rows=300185 width=4) (actual time=787.030..787.030 rows=300441 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10563kB
                                       Buffers: shared hit=35272 read=1159
                                       ->  Bitmap Heap Scan on customer  (cost=6954.91..45985.23 rows=300185 width=4) (actual time=125.731..640.340 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Buffers: shared hit=35272 read=1159
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6879.87 rows=300185 width=0) (actual time=112.757..112.757 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 83021.887 ms
(35 rows)

COMMIT;
COMMIT