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 = 'AUTOMOBILE'
	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=2683231.37..2683231.39 rows=10 width=20) (actual time=31540.374..31540.378 rows=10 loops=1)
   Buffers: shared hit=822790 read=541449 dirtied=145 written=853
   ->  Sort  (cost=2683231.37..2691159.75 rows=3171354 width=20) (actual time=31540.370..31540.372 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=822790 read=541449 dirtied=145 written=853
         ->  HashAggregate  (cost=2582986.01..2614699.55 rows=3171354 width=20) (actual time=31474.038..31519.999 rows=113656 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=822784 read=541449 dirtied=145 written=853
               ->  Hash Join  (cost=554509.04..2535415.70 rows=3171354 width=20) (actual time=8346.219..31231.078 rows=299845 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=822784 read=541449 dirtied=145 written=853
                     ->  Seq Scan on lineitem  (cost=0.00..1827919.74 rows=32339569 width=12) (actual time=0.069..17772.438 rows=32133288 loops=1)
                           Filter: (l_shipdate > '1995-03-23'::date)
                           Rows Removed by Filter: 27852399
                           Buffers: shared hit=632562 read=440294
                     ->  Hash  (cost=535999.96..535999.96 rows=1480726 width=12) (actual time=8335.486..8335.486 rows=1467783 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79453kB
                           Buffers: shared hit=190222 read=101155 dirtied=145 written=853
                           ->  Hash Join  (cost=49723.50..535999.96 rows=1480726 width=12) (actual time=476.566..7831.158 rows=1467783 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=190222 read=101155 dirtied=145 written=853
                                 ->  Seq Scan on orders  (cost=0.00..443694.47 rows=7406595 width=16) (actual time=0.022..4917.235 rows=7339744 loops=1)
                                       Filter: (o_orderdate < '1995-03-23'::date)
                                       Rows Removed by Filter: 7660256
                                       Buffers: shared hit=154947 read=100003 dirtied=145 written=784
                                 ->  Hash  (cost=45975.00..45975.00 rows=299880 width=4) (actual time=473.645..473.645 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=35275 read=1152 written=69
                                       ->  Bitmap Heap Scan on customer  (cost=6948.50..45975.00 rows=299880 width=4) (actual time=72.962..389.732 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35275 read=1152 written=69
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6873.53 rows=299880 width=0) (actual time=64.092..64.092 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152 written=69
 Planning time: 3.808 ms
 Execution time: 31564.713 ms
(38 rows)

COMMIT;
COMMIT