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 '1995-03-14'
	and l_shipdate > date '1995-03-14'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2686481.52..2686481.54 rows=10 width=20) (actual time=34710.390..34710.394 rows=10 loops=1)
   Buffers: shared hit=748439 read=617205 written=134
   ->  Sort  (cost=2686481.52..2694414.77 rows=3173303 width=20) (actual time=34710.386..34710.388 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=748439 read=617205 written=134
         ->  HashAggregate  (cost=2586174.55..2617907.58 rows=3173303 width=20) (actual time=34630.293..34688.921 rows=113414 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=748433 read=617205 written=134
               ->  Hash Join  (cost=554591.34..2538575.00 rows=3173303 width=20) (actual time=9035.937..34360.972 rows=298684 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=748433 read=617205 written=134
                     ->  Seq Scan on lineitem  (cost=0.00..1829728.70 rows=32672515 width=12) (actual time=0.049..19098.954 rows=32389697 loops=1)
                           Filter: (l_shipdate > '1995-03-14'::date)
                           Rows Removed by Filter: 27654967
                           Buffers: shared hit=537275 read=536643 written=1
                     ->  Hash  (cost=536234.82..536234.82 rows=1468522 width=12) (actual time=9021.212..9021.212 rows=1458622 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79060kB
                           Buffers: shared hit=211158 read=80562 written=133
                           ->  Hash Join  (cost=49737.81..536234.82 rows=1468522 width=12) (actual time=770.041..8486.356 rows=1458622 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=211158 read=80562 written=133
                                 ->  Seq Scan on orders  (cost=0.00..444294.89 rows=7337839 width=16) (actual time=0.026..5268.811 rows=7290745 loops=1)
                                       Filter: (o_orderdate < '1995-03-14'::date)
                                       Rows Removed by Filter: 7724255
                                       Buffers: shared hit=180292 read=75003 written=124
                                 ->  Hash  (cost=45985.38..45985.38 rows=300195 width=4) (actual time=767.199..767.199 rows=299496 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14626kB
                                       Buffers: shared hit=30866 read=5559 written=9
                                       ->  Bitmap Heap Scan on customer  (cost=6954.94..45985.38 rows=300195 width=4) (actual time=73.657..666.608 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=30866 read=5559 written=9
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6879.89 rows=300195 width=0) (actual time=64.747..64.747 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1150
 Planning time: 3.504 ms
 Execution time: 34764.050 ms
(38 rows)

COMMIT;
COMMIT