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 '1995-03-16'
	and l_shipdate > date '1995-03-16'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2696913.86..2696913.89 rows=10 width=20) (actual time=37577.228..37577.233 rows=10 loops=1)
   Buffers: shared hit=875677 read=495255 written=61
   ->  Sort  (cost=2696913.86..2704880.46 rows=3186639 width=20) (actual time=37577.225..37577.226 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=875677 read=495255 written=61
         ->  HashAggregate  (cost=2596185.35..2628051.74 rows=3186639 width=20) (actual time=37505.943..37556.262 rows=114139 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=875671 read=495255 written=61
               ->  Hash Join  (cost=556691.39..2548385.77 rows=3186639 width=20) (actual time=10807.759..37206.537 rows=302537 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=875671 read=495255 written=61
                     ->  Seq Scan on lineitem  (cost=0.00..1837003.88 rows=32753097 width=12) (actual time=0.030..19715.675 rows=32340072 loops=1)
                           Filter: (l_shipdate > '1995-03-16'::date)
                           Rows Removed by Filter: 27704922
                           Buffers: shared hit=613778 read=464410 written=1
                     ->  Hash  (cost=538230.18..538230.18 rows=1476897 width=12) (actual time=10792.105..10792.105 rows=1464520 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79313kB
                           Buffers: shared hit=261893 read=30845 written=60
                           ->  Hash Join  (cost=49741.42..538230.18 rows=1476897 width=12) (actual time=543.614..10174.239 rows=1464520 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=261893 read=30845 written=60
                                 ->  Seq Scan on orders  (cost=0.00..446056.09 rows=7376987 width=16) (actual time=0.024..5033.579 rows=7303246 loops=1)
                                       Filter: (o_orderdate < '1995-03-16'::date)
                                       Rows Removed by Filter: 7711754
                                       Buffers: shared hit=230184 read=26123 written=53
                                 ->  Hash  (cost=45987.60..45987.60 rows=300305 width=4) (actual time=539.920..539.920 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=31709 read=4722 written=7
                                       ->  Bitmap Heap Scan on customer  (cost=6955.79..45987.60 rows=300305 width=4) (actual time=77.551..437.678 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=31709 read=4722 written=7
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6880.72 rows=300305 width=0) (actual time=68.628..68.628 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 3.555 ms
 Execution time: 37605.332 ms
(38 rows)

COMMIT;
COMMIT