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 '1995-03-25'
	and l_shipdate > date '1995-03-25'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2689857.35..2689857.37 rows=10 width=20) (actual time=32357.180..32357.186 rows=10 loops=1)
   Buffers: shared hit=703376 read=663584 dirtied=70 written=66
   ->  Sort  (cost=2689857.35..2697848.30 rows=3196383 width=20) (actual time=32357.176..32357.178 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=703376 read=663584 dirtied=70 written=66
         ->  HashAggregate  (cost=2588820.83..2620784.66 rows=3196383 width=20) (actual time=32283.322..32336.653 rows=113594 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=703370 read=663584 dirtied=70 written=66
               ->  Hash Join  (cost=556088.05..2540875.08 rows=3196383 width=20) (actual time=8841.770..32033.976 rows=300610 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=703370 read=663584 dirtied=70 written=66
                     ->  Seq Scan on lineitem  (cost=0.00..1831531.76 rows=32344385 width=12) (actual time=0.029..17628.914 rows=32113994 loops=1)
                           Filter: (l_shipdate > '1995-03-25'::date)
                           Rows Removed by Filter: 27930088
                           Buffers: shared hit=489107 read=585869 written=1
                     ->  Hash  (cost=537391.92..537391.92 rows=1495690 width=12) (actual time=8830.320..8830.320 rows=1471622 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79618kB
                           Buffers: shared hit=214263 read=77715 dirtied=70 written=65
                           ->  Hash Join  (cost=49803.50..537391.92 rows=1495690 width=12) (actual time=475.607..8307.900 rows=1471622 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=214263 read=77715 dirtied=70 written=65
                                 ->  Seq Scan on orders  (cost=0.00..444735.19 rows=7439023 width=16) (actual time=0.024..4735.157 rows=7359680 loops=1)
                                       Filter: (o_orderdate < '1995-03-25'::date)
                                       Rows Removed by Filter: 7655320
                                       Buffers: shared hit=179002 read=76546 dirtied=70 written=63
                                 ->  Hash  (cost=46033.62..46033.62 rows=301590 width=4) (actual time=472.108..472.108 rows=300441 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14659kB
                                       Buffers: shared hit=35261 read=1169 written=2
                                       ->  Bitmap Heap Scan on customer  (cost=6985.75..46033.62 rows=301590 width=4) (actual time=72.543..377.049 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Heap Blocks: exact=35276
                                             Buffers: shared hit=35261 read=1169 written=2
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6910.35 rows=301590 width=0) (actual time=63.617..63.617 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1154 written=2
 Planning time: 3.621 ms
 Execution time: 32375.775 ms
(38 rows)

COMMIT;
COMMIT