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 '1995-03-15'
	and l_shipdate > date '1995-03-15'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2674474.82..2674474.85 rows=10 width=20) (actual time=32964.106..32964.110 rows=10 loops=1)
   Buffers: shared hit=773942 read=584635 dirtied=606 written=1258
   ->  Sort  (cost=2674474.82..2682433.80 rows=3183592 width=20) (actual time=32964.103..32964.106 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=773942 read=584635 dirtied=606 written=1258
         ->  HashAggregate  (cost=2573842.62..2605678.54 rows=3183592 width=20) (actual time=32894.275..32943.463 rows=114011 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=773936 read=584635 dirtied=606 written=1258
               ->  Hash Join  (cost=551945.55..2526088.75 rows=3183592 width=20) (actual time=8704.165..32635.187 rows=302188 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=773936 read=584635 dirtied=606 written=1258
                     ->  Seq Scan on lineitem  (cost=0.00..1820266.26 rows=32544271 width=12) (actual time=0.072..18223.294 rows=32333805 loops=1)
                           Filter: (l_shipdate > '1995-03-15'::date)
                           Rows Removed by Filter: 27651747
                           Buffers: shared hit=590833 read=477532 dirtied=606 written=295
                     ->  Hash  (cost=533567.01..533567.01 rows=1470283 width=12) (actual time=8691.972..8691.972 rows=1461849 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79198kB
                           Buffers: shared hit=183103 read=107103 written=963
                           ->  Hash Join  (cost=49816.18..533567.01 rows=1470283 width=12) (actual time=480.875..8132.024 rows=1461849 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=183103 read=107103 written=963
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7306240 width=16) (actual time=0.028..5091.480 rows=7289566 loops=1)
                                       Filter: (o_orderdate < '1995-03-15'::date)
                                       Rows Removed by Filter: 7710434
                                       Buffers: shared hit=147824 read=105951 written=925
                                 ->  Hash  (cost=46042.99..46042.99 rows=301855 width=4) (actual time=477.932..477.932 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=35279 read=1152 written=38
                                       ->  Bitmap Heap Scan on customer  (cost=6991.80..46042.99 rows=301855 width=4) (actual time=74.016..391.185 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=35279 read=1152 written=38
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6916.34 rows=301855 width=0) (actual time=64.896..64.896 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared hit=2 read=1152 written=38
 Planning time: 3.963 ms
 Execution time: 33084.988 ms
(38 rows)

COMMIT;
COMMIT