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 '1995-03-31'
	and l_shipdate > date '1995-03-31'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2817665.17..2817665.20 rows=10 width=20) (actual time=115390.978..115390.983 rows=10 loops=1)
   Buffers: shared hit=748530 read=625034 dirtied=298 written=21
   ->  Sort  (cost=2817665.17..2825670.26 rows=3202034 width=20) (actual time=115390.973..115390.976 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=748530 read=625034 dirtied=298 written=21
         ->  HashAggregate  (cost=2716450.03..2748470.37 rows=3202034 width=20) (actual time=115290.125..115367.645 rows=113371 loops=1)
               Buffers: shared hit=748524 read=625034 dirtied=298 written=21
               ->  Hash Join  (cost=633537.03..2668419.52 rows=3202034 width=20) (actual time=36738.130..114663.190 rows=299261 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=748524 read=625034 dirtied=298 written=21
                     ->  Seq Scan on lineitem  (cost=0.00..1840629.69 rows=32446492 width=12) (actual time=0.052..50208.625 rows=31964916 loops=1)
                           Filter: (l_shipdate > '1995-03-31'::date)
                           Rows Removed by Filter: 28080117
                           Buffers: shared hit=507635 read=572684
                     ->  Hash  (cost=614774.37..614774.37 rows=1501013 width=12) (actual time=36735.757..36735.757 rows=1479824 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63587kB
                           Buffers: shared hit=240889 read=52350 dirtied=298 written=21
                           ->  Hash Join  (cost=49746.29..614774.37 rows=1501013 width=12) (actual time=2810.541..34454.604 rows=1479824 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=240889 read=52350 dirtied=298 written=21
                                 ->  Seq Scan on orders  (cost=0.00..446936.69 rows=7496819 width=16) (actual time=0.020..10904.654 rows=7396635 loops=1)
                                       Filter: (o_orderdate < '1995-03-31'::date)
                                       Rows Removed by Filter: 7618365
                                       Buffers: shared hit=226413 read=30400 dirtied=298 written=21
                                 ->  Hash  (cost=45992.16..45992.16 rows=300330 width=4) (actual time=2810.267..2810.267 rows=299496 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10530kB
                                       Buffers: shared hit=14476 read=21950
                                       ->  Bitmap Heap Scan on customer  (cost=6960.04..45992.16 rows=300330 width=4) (actual time=208.662..2592.806 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Buffers: shared hit=14476 read=21950
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6884.96 rows=300330 width=0) (actual time=196.563..196.563 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1151
 Total runtime: 115444.288 ms
(35 rows)

COMMIT;
COMMIT