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 = 'MACHINERY'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-23'
	and l_shipdate > date '1995-03-23'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2665988.30..2665988.32 rows=10 width=20) (actual time=39676.097..39676.100 rows=10 loops=1)
   Buffers: shared hit=918927 read=437506 dirtied=28 written=1664
   ->  Sort  (cost=2665988.30..2673799.13 rows=3124335 width=20) (actual time=39676.092..39676.093 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=918927 read=437506 dirtied=28 written=1664
         ->  HashAggregate  (cost=2567229.19..2598472.54 rows=3124335 width=20) (actual time=39598.322..39654.620 rows=113491 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=918921 read=437506 dirtied=28 written=1664
               ->  Hash Join  (cost=551022.05..2520364.17 rows=3124335 width=20) (actual time=12748.696..39304.651 rows=300404 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=918921 read=437506 dirtied=28 written=1664
                     ->  Seq Scan on lineitem  (cost=0.00..1817046.11 rows=32280708 width=12) (actual time=0.046..19092.328 rows=32133314 loops=1)
                           Filter: (l_shipdate > '1995-03-23'::date)
                           Rows Removed by Filter: 27852015
                           Buffers: shared hit=736424 read=330051 dirtied=1 written=5
                     ->  Hash  (cost=532856.46..532856.46 rows=1453247 width=12) (actual time=12739.520..12739.520 rows=1467518 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79442kB
                           Buffers: shared hit=182497 read=107455 dirtied=27 written=1659
                           ->  Hash Join  (cost=49575.77..532856.46 rows=1453247 width=12) (actual time=1114.407..12036.172 rows=1467518 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=182497 read=107455 dirtied=27 written=1659
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7343711 width=16) (actual time=0.023..6077.724 rows=7339759 loops=1)
                                       Filter: (o_orderdate < '1995-03-23'::date)
                                       Rows Removed by Filter: 7660241
                                       Buffers: shared hit=149047 read=104475 dirtied=27 written=1659
                                 ->  Hash  (cost=45865.34..45865.34 rows=296835 width=4) (actual time=1111.434..1111.434 rows=300441 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14659kB
                                       Buffers: shared hit=33450 read=2980
                                       ->  Bitmap Heap Scan on customer  (cost=6876.90..45865.34 rows=296835 width=4) (actual time=171.783..958.802 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Heap Blocks: exact=35276
                                             Buffers: shared hit=33450 read=2980
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6802.69 rows=296835 width=0) (actual time=154.145..154.145 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 3.432 ms
 Execution time: 39698.183 ms
(38 rows)

COMMIT;
COMMIT