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 '1995-03-28'
	and l_shipdate > date '1995-03-28'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2669417.56..2669417.59 rows=10 width=20) (actual time=28625.385..28625.389 rows=10 loops=1)
   Buffers: shared hit=1105586 read=252166 dirtied=31 written=34
   ->  Sort  (cost=2669417.56..2677278.41 rows=3144339 width=20) (actual time=28625.382..28625.384 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=1105586 read=252166 dirtied=31 written=34
         ->  HashAggregate  (cost=2570026.13..2601469.52 rows=3144339 width=20) (actual time=28559.351..28605.685 rows=113311 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=1105580 read=252166 dirtied=31 written=34
               ->  Hash Join  (cost=552093.90..2522861.05 rows=3144339 width=20) (actual time=7119.738..28331.526 rows=299151 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1105580 read=252166 dirtied=31 written=34
                     ->  Seq Scan on lineitem  (cost=0.00..1818872.36 rows=32120373 width=12) (actual time=0.034..16309.376 rows=32040389 loops=1)
                           Filter: (l_shipdate > '1995-03-28'::date)
                           Rows Removed by Filter: 28005214
                           Buffers: shared hit=863178 read=204368
                     ->  Hash  (cost=533702.41..533702.41 rows=1471319 width=12) (actual time=7107.736..7107.736 rows=1476078 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79810kB
                           Buffers: shared hit=242402 read=47798 dirtied=31 written=34
                           ->  Hash Join  (cost=49701.25..533702.41 rows=1471319 width=12) (actual time=695.931..6632.883 rows=1476078 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=242402 read=47798 dirtied=31 written=34
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7370232 width=16) (actual time=0.017..3826.965 rows=7377947 loops=1)
                                       Filter: (o_orderdate < '1995-03-28'::date)
                                       Rows Removed by Filter: 7637053
                                       Buffers: shared hit=242399 read=11376 dirtied=31
                                 ->  Hash  (cost=45958.19..45958.19 rows=299445 width=4) (actual time=692.981..692.981 rows=299496 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14626kB
                                       Buffers: shared hit=3 read=36422 written=34
                                       ->  Bitmap Heap Scan on customer  (cost=6937.13..45958.19 rows=299445 width=4) (actual time=67.674..604.577 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=3 read=36422 written=34
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6862.26 rows=299445 width=0) (actual time=59.561..59.561 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1150
 Planning time: 3.283 ms
 Execution time: 28653.613 ms
(38 rows)

COMMIT;
COMMIT