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 = 'FURNITURE'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-02'
	and l_shipdate > date '1995-03-02'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2698088.62..2698088.64 rows=10 width=20) (actual time=34251.826..34251.831 rows=10 loops=1)
   Buffers: shared hit=716705 read=654221 dirtied=168 written=401
   ->  Sort  (cost=2698088.62..2706067.63 rows=3191605 width=20) (actual time=34251.823..34251.825 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=716705 read=654221 dirtied=168 written=401
         ->  HashAggregate  (cost=2597203.13..2629119.18 rows=3191605 width=20) (actual time=34182.684..34231.238 rows=113557 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=716699 read=654221 dirtied=168 written=401
               ->  Hash Join  (cost=556020.13..2549329.06 rows=3191605 width=20) (actual time=9229.918..33927.015 rows=299162 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=716699 read=654221 dirtied=168 written=401
                     ->  Seq Scan on lineitem  (cost=0.00..1837002.56 rows=33170751 width=12) (actual time=0.062..19245.354 rows=32690141 loops=1)
                           Filter: (l_shipdate > '1995-03-02'::date)
                           Rows Removed by Filter: 27354853
                           Buffers: shared hit=542785 read=535403 written=5
                     ->  Hash  (cost=537762.95..537762.95 rows=1460574 width=12) (actual time=9217.699..9217.699 rows=1443631 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78416kB
                           Buffers: shared hit=173914 read=118818 dirtied=168 written=396
                           ->  Hash Join  (cost=49740.43..537762.95 rows=1460574 width=12) (actual time=827.016..8665.274 rows=1443631 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=173914 read=118818 dirtied=168 written=396
                                 ->  Seq Scan on orders  (cost=0.00..446056.09 rows=7296184 width=16) (actual time=0.026..5351.691 rows=7215455 loops=1)
                                       Filter: (o_orderdate < '1995-03-02'::date)
                                       Rows Removed by Filter: 7799545
                                       Buffers: shared hit=173912 read=82395 dirtied=168 written=356
                                 ->  Hash  (cost=45987.00..45987.00 rows=300275 width=4) (actual time=823.984..823.984 rows=299496 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14626kB
                                       Buffers: shared hit=2 read=36423 written=40
                                       ->  Bitmap Heap Scan on customer  (cost=6955.56..45987.00 rows=300275 width=4) (actual time=78.877..726.494 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36423 written=40
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6880.49 rows=300275 width=0) (actual time=69.618..69.618 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1150 written=1
 Planning time: 4.316 ms
 Execution time: 34280.354 ms
(38 rows)

COMMIT;
COMMIT