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 '1995-03-07'
	and l_shipdate > date '1995-03-07'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2668262.52..2668262.55 rows=10 width=20) (actual time=38504.292..38504.297 rows=10 loops=1)
   Buffers: shared hit=788931 read=567497 dirtied=24 written=1780
   ->  Sort  (cost=2668262.52..2676132.41 rows=3147956 width=20) (actual time=38504.286..38504.287 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=788931 read=567497 dirtied=24 written=1780
         ->  HashAggregate  (cost=2568756.77..2600236.33 rows=3147956 width=20) (actual time=38423.611..38483.472 rows=113461 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=788925 read=567497 dirtied=24 written=1780
               ->  Hash Join  (cost=550715.60..2521537.43 rows=3147956 width=20) (actual time=12435.446..38134.112 rows=298593 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=788925 read=567497 dirtied=24 written=1780
                     ->  Seq Scan on lineitem  (cost=0.00..1817047.41 rows=32611961 width=12) (actual time=0.092..18521.374 rows=32533369 loops=1)
                           Filter: (l_shipdate > '1995-03-07'::date)
                           Rows Removed by Filter: 27451960
                           Buffers: shared hit=615019 read=451456 written=5
                     ->  Hash  (cost=532598.59..532598.59 rows=1449361 width=12) (actual time=12422.689..12422.689 rows=1448442 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78622kB
                           Buffers: shared hit=173906 read=116041 dirtied=24 written=1775
                           ->  Hash Join  (cost=49737.81..532598.59 rows=1449361 width=12) (actual time=1081.196..11740.721 rows=1448442 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=173906 read=116041 dirtied=24 written=1775
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7242097 width=16) (actual time=0.037..6005.053 rows=7239643 loops=1)
                                       Filter: (o_orderdate < '1995-03-07'::date)
                                       Rows Removed by Filter: 7760357
                                       Buffers: shared hit=139891 read=113631 dirtied=24 written=1775
                                 ->  Hash  (cost=45985.38..45985.38 rows=300195 width=4) (actual time=1077.621..1077.621 rows=299496 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14626kB
                                       Buffers: shared hit=34015 read=2410
                                       ->  Bitmap Heap Scan on customer  (cost=6954.94..45985.38 rows=300195 width=4) (actual time=154.201..922.360 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=34015 read=2410
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6879.89 rows=300195 width=0) (actual time=134.983..134.983 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1150
 Planning time: 3.117 ms
 Execution time: 38527.671 ms
(38 rows)

COMMIT;
COMMIT