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 = 'BUILDING'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-11'
	and l_shipdate > date '1995-03-11'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2682862.08..2682862.10 rows=10 width=20) (actual time=36793.127..36793.133 rows=10 loops=1)
   Buffers: shared hit=801873 read=562461 written=16
   ->  Sort  (cost=2682862.08..2690749.83 rows=3155101 width=20) (actual time=36793.123..36793.127 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=801873 read=562461 written=16
         ->  HashAggregate  (cost=2583130.47..2614681.48 rows=3155101 width=20) (actual time=36703.932..36770.447 rows=114121 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=801867 read=562461 written=16
               ->  Hash Join  (cost=553677.58..2535803.96 rows=3155101 width=20) (actual time=8899.615..36416.700 rows=302059 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=801867 read=562461 written=16
                     ->  Seq Scan on lineitem  (cost=0.00..1827915.45 rows=32709312 width=12) (actual time=0.046..19967.868 rows=32465755 loops=1)
                           Filter: (l_shipdate > '1995-03-11'::date)
                           Rows Removed by Filter: 27579555
                           Buffers: shared hit=558044 read=514812 written=1
                     ->  Hash  (cost=535465.01..535465.01 rows=1457005 width=12) (actual time=8891.785..8891.785 rows=1458145 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79039kB
                           Buffers: shared hit=243823 read=47649 written=15
                           ->  Hash Join  (cost=49736.01..535465.01 rows=1457005 width=12) (actual time=548.600..8379.895 rows=1458145 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=243823 read=47649 written=15
                                 ->  Seq Scan on orders  (cost=0.00..443852.85 rows=7281627 width=16) (actual time=0.030..5265.268 rows=7271831 loops=1)
                                       Filter: (o_orderdate < '1995-03-11'::date)
                                       Rows Removed by Filter: 7743169
                                       Buffers: shared hit=208546 read=46495 written=15
                                 ->  Hash  (cost=45984.26..45984.26 rows=300140 width=4) (actual time=546.186..546.186 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=35277 read=1154
                                       ->  Bitmap Heap Scan on customer  (cost=6954.51..45984.26 rows=300140 width=4) (actual time=81.368..458.088 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=35277 read=1154
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6879.48 rows=300140 width=0) (actual time=71.543..71.543 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 4.215 ms
 Execution time: 36815.897 ms
(38 rows)

COMMIT;
COMMIT