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 '1995-03-09'
	and l_shipdate > date '1995-03-09'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2678195.57..2678195.60 rows=10 width=20) (actual time=36277.936..36277.941 rows=10 loops=1)
   Buffers: shared hit=845224 read=515160 dirtied=109 written=202
   ->  Sort  (cost=2678195.57..2686159.44 rows=3185545 width=20) (actual time=36277.931..36277.933 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=845224 read=515160 dirtied=109 written=202
         ->  HashAggregate  (cost=2577501.64..2609357.09 rows=3185545 width=20) (actual time=36195.069..36256.315 rows=114087 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=845218 read=515160 dirtied=109 written=202
               ->  Hash Join  (cost=552637.09..2529718.47 rows=3185545 width=20) (actual time=9319.460..35911.077 rows=302245 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=845218 read=515160 dirtied=109 written=202
                     ->  Seq Scan on lineitem  (cost=0.00..1822482.89 rows=32731478 width=12) (actual time=0.028..19312.882 rows=32483876 loops=1)
                           Filter: (l_shipdate > '1995-03-09'::date)
                           Rows Removed by Filter: 27501905
                           Buffers: shared hit=629376 read=440290 dirtied=1 written=7
                     ->  Hash  (cost=534316.00..534316.00 rows=1465687 width=12) (actual time=9306.305..9306.305 rows=1454360 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78877kB
                           Buffers: shared hit=215842 read=74870 dirtied=108 written=195
                           ->  Hash Join  (cost=49816.18..534316.00 rows=1465687 width=12) (actual time=761.698..8691.079 rows=1454360 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=215842 read=74870 dirtied=108 written=195
                                 ->  Seq Scan on orders  (cost=0.00..442530.20 rows=7283400 width=16) (actual time=0.027..4779.778 rows=7252253 loops=1)
                                       Filter: (o_orderdate < '1995-03-09'::date)
                                       Rows Removed by Filter: 7747747
                                       Buffers: shared hit=213870 read=40411 dirtied=108 written=195
                                 ->  Hash  (cost=46042.99..46042.99 rows=301855 width=4) (actual time=758.601..758.601 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=1972 read=34459
                                       ->  Bitmap Heap Scan on customer  (cost=6991.80..46042.99 rows=301855 width=4) (actual time=74.275..652.543 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=1972 read=34459
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6916.34 rows=301855 width=0) (actual time=64.982..64.982 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 3.653 ms
 Execution time: 36304.083 ms
(38 rows)

COMMIT;
COMMIT