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 '1995-03-08'
	and l_shipdate > date '1995-03-08'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2690835.89..2690835.91 rows=10 width=20) (actual time=37381.075..37381.078 rows=10 loops=1)
   Buffers: shared hit=929026 read=439258 dirtied=229 written=50
   ->  Sort  (cost=2690835.89..2698747.38 rows=3164597 width=20) (actual time=37381.071..37381.072 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=929026 read=439258 dirtied=229 written=50
         ->  HashAggregate  (cost=2590804.12..2622450.09 rows=3164597 width=20) (actual time=37279.562..37359.289 rows=114091 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=929020 read=439258 dirtied=229 written=50
               ->  Hash Join  (cost=555054.65..2543335.16 rows=3164597 width=20) (actual time=10046.005..37001.213 rows=301962 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=929020 read=439258 dirtied=229 written=50
                     ->  Seq Scan on lineitem  (cost=0.00..1833350.52 rows=32875738 width=12) (actual time=0.042..19668.236 rows=32539137 loops=1)
                           Filter: (l_shipdate > '1995-03-08'::date)
                           Rows Removed by Filter: 27505039
                           Buffers: shared hit=688635 read=387411 written=2
                     ->  Hash  (cost=536825.59..536825.59 rows=1458325 width=12) (actual time=10025.079..10025.079 rows=1454415 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78879kB
                           Buffers: shared hit=240385 read=51847 dirtied=229 written=48
                           ->  Hash Join  (cost=49736.01..536825.59 rows=1458325 width=12) (actual time=890.703..9319.830 rows=1454415 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=240385 read=51847 dirtied=229 written=48
                                 ->  Seq Scan on orders  (cost=0.00..445175.49 rows=7288223 width=16) (actual time=0.028..5189.990 rows=7253508 loops=1)
                                       Filter: (o_orderdate < '1995-03-08'::date)
                                       Rows Removed by Filter: 7761492
                                       Buffers: shared hit=217263 read=38538 dirtied=229 written=32
                                 ->  Hash  (cost=45984.26..45984.26 rows=300140 width=4) (actual time=885.934..885.934 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=23122 read=13309 written=16
                                       ->  Bitmap Heap Scan on customer  (cost=6954.51..45984.26 rows=300140 width=4) (actual time=115.698..733.034 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=23122 read=13309 written=16
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6879.48 rows=300140 width=0) (actual time=102.905..102.905 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154 written=1
 Planning time: 6.205 ms
 Execution time: 37414.590 ms
(38 rows)

COMMIT;
COMMIT