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 '1995-03-04'
	and l_shipdate > date '1995-03-04'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2667677.21..2667677.24 rows=10 width=20) (actual time=39567.861..39567.866 rows=10 loops=1)
   Buffers: shared hit=837373 read=519055 dirtied=252 written=2324
   ->  Sort  (cost=2667677.21..2675526.11 rows=3139559 width=20) (actual time=39567.858..39567.858 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=837373 read=519055 dirtied=252 written=2324
         ->  HashAggregate  (cost=2568436.88..2599832.47 rows=3139559 width=20) (actual time=39490.186..39546.975 rows=113488 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=837367 read=519055 dirtied=252 written=2324
               ->  Hash Join  (cost=550589.37..2521343.50 rows=3139559 width=20) (actual time=12119.035..39205.311 rows=298876 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=837367 read=519055 dirtied=252 written=2324
                     ->  Seq Scan on lineitem  (cost=0.00..1817047.86 rows=32616181 width=12) (actual time=0.016..19053.534 rows=32608233 loops=1)
                           Filter: (l_shipdate > '1995-03-04'::date)
                           Rows Removed by Filter: 27377096
                           Buffers: shared hit=646350 read=420125 written=4
                     ->  Hash  (cost=532523.02..532523.02 rows=1445308 width=12) (actual time=12110.528..12110.528 rows=1444679 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78461kB
                           Buffers: shared hit=191017 read=98930 dirtied=252 written=2320
                           ->  Hash Join  (cost=49689.56..532523.02 rows=1445308 width=12) (actual time=797.870..11418.821 rows=1444679 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=191017 read=98930 dirtied=252 written=2320
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7245622 width=16) (actual time=0.015..6043.665 rows=7220748 loops=1)
                                       Filter: (o_orderdate < '1995-03-04'::date)
                                       Rows Removed by Filter: 7779252
                                       Buffers: shared hit=156444 read=97078 dirtied=252 written=2320
                                 ->  Hash  (cost=45949.43..45949.43 rows=299210 width=4) (actual time=795.400..795.400 rows=299496 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14626kB
                                       Buffers: shared hit=34573 read=1852
                                       ->  Bitmap Heap Scan on customer  (cost=6931.30..45949.43 rows=299210 width=4) (actual time=110.143..642.312 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=34573 read=1852
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6856.50 rows=299210 width=0) (actual time=97.040..97.040 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1150
 Planning time: 6.420 ms
 Execution time: 39589.012 ms
(38 rows)

COMMIT;
COMMIT