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 '1995-03-21'
	and l_shipdate > date '1995-03-21'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2766806.03..2766806.06 rows=10 width=20) (actual time=64010.404..64010.409 rows=10 loops=1)
   Buffers: shared hit=602857 read=766749 dirtied=251
   ->  Sort  (cost=2766806.03..2774727.49 rows=3168581 width=20) (actual time=64010.400..64010.403 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=602857 read=766749 dirtied=251
         ->  HashAggregate  (cost=2666648.33..2698334.14 rows=3168581 width=20) (actual time=63905.615..63989.335 rows=113234 loops=1)
               Buffers: shared hit=602851 read=766749 dirtied=251
               ->  Hash Join  (cost=630225.78..2619119.61 rows=3168581 width=20) (actual time=22343.275..63554.586 rows=298608 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=602851 read=766749 dirtied=251
                     ->  Seq Scan on lineitem  (cost=0.00..1835185.45 rows=32539354 width=12) (actual time=0.120..20557.487 rows=32182396 loops=1)
                           Filter: (l_shipdate > '1995-03-21'::date)
                           Rows Removed by Filter: 27802430
                           Buffers: shared hit=311821 read=765299
                     ->  Hash  (cost=611766.84..611766.84 rows=1476715 width=12) (actual time=22340.093..22340.093 rows=1465938 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62990kB
                           Buffers: shared hit=291030 read=1450 dirtied=251
                           ->  Hash Join  (cost=49708.91..611766.84 rows=1476715 width=12) (actual time=567.037..21237.927 rows=1465938 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=291030 read=1450 dirtied=251
                                 ->  Seq Scan on orders  (cost=0.00..445615.79 rows=7394545 width=16) (actual time=0.026..4968.808 rows=7327294 loops=1)
                                       Filter: (o_orderdate < '1995-03-21'::date)
                                       Rows Removed by Filter: 7672706
                                       Buffers: shared hit=255755 read=299 dirtied=251
                                 ->  Hash  (cost=45964.47..45964.47 rows=299555 width=4) (actual time=566.734..566.734 rows=299496 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10530kB
                                       Buffers: shared hit=35275 read=1151
                                       ->  Bitmap Heap Scan on customer  (cost=6942.03..45964.47 rows=299555 width=4) (actual time=114.629..474.526 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Buffers: shared hit=35275 read=1151
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6867.14 rows=299555 width=0) (actual time=102.726..102.726 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1151
 Total runtime: 64056.404 ms
(35 rows)

COMMIT;
COMMIT