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 = 'AUTOMOBILE'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-18'
	and l_shipdate > date '1995-03-18'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2670577.55..2670577.57 rows=10 width=20) (actual time=32398.070..32398.075 rows=10 loops=1)
   Buffers: shared hit=846069 read=511685 written=7
   ->  Sort  (cost=2670577.55..2678465.74 rows=3155276 width=20) (actual time=32398.066..32398.068 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=846069 read=511685 written=7
         ->  HashAggregate  (cost=2570840.41..2602393.17 rows=3155276 width=20) (actual time=32322.418..32377.305 rows=113934 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=846063 read=511685 written=7
               ->  Hash Join  (cost=551935.98..2523511.27 rows=3155276 width=20) (actual time=8469.789..32057.700 rows=300571 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=846063 read=511685 written=7
                     ->  Seq Scan on lineitem  (cost=0.00..1818872.61 rows=32306644 width=12) (actual time=0.048..17788.336 rows=32290378 loops=1)
                           Filter: (l_shipdate > '1995-03-18'::date)
                           Rows Removed by Filter: 27755225
                           Buffers: shared hit=619580 read=447966 written=7
                     ->  Hash  (cost=533586.93..533586.93 rows=1467924 width=12) (actual time=8449.227..8449.227 rows=1463039 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79249kB
                           Buffers: shared hit=226483 read=63719
                           ->  Hash Join  (cost=49723.50..533586.93 rows=1467924 width=12) (actual time=766.355..7915.031 rows=1463039 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=226483 read=63719
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7342558 width=16) (actual time=0.027..4594.207 rows=7315843 loops=1)
                                       Filter: (o_orderdate < '1995-03-18'::date)
                                       Rows Removed by Filter: 7699157
                                       Buffers: shared hit=226481 read=27294
                                 ->  Hash  (cost=45975.00..45975.00 rows=299880 width=4) (actual time=763.108..763.108 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=2 read=36425
                                       ->  Bitmap Heap Scan on customer  (cost=6948.50..45975.00 rows=299880 width=4) (actual time=72.365..659.321 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6873.53 rows=299880 width=0) (actual time=63.107..63.107 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 3.942 ms
 Execution time: 32475.793 ms
(38 rows)

COMMIT;
COMMIT