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 '1995-03-13'
	and l_shipdate > date '1995-03-13'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2667162.38..2667162.41 rows=10 width=20) (actual time=40386.968..40386.972 rows=10 loops=1)
   Buffers: shared hit=829113 read=527317 dirtied=31 written=1812
   ->  Sort  (cost=2667162.38..2675005.12 rows=3137095 width=20) (actual time=40386.963..40386.964 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=829113 read=527317 dirtied=31 written=1812
         ->  HashAggregate  (cost=2567999.94..2599370.89 rows=3137095 width=20) (actual time=40299.655..40365.377 rows=113758 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=829107 read=527317 dirtied=31 written=1812
               ->  Hash Join  (cost=550782.21..2520943.51 rows=3137095 width=20) (actual time=12415.505..40003.082 rows=300310 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=829107 read=527317 dirtied=31 written=1812
                     ->  Seq Scan on lineitem  (cost=0.00..1817043.60 rows=32465800 width=12) (actual time=0.056..19327.213 rows=32383480 loops=1)
                           Filter: (l_shipdate > '1995-03-13'::date)
                           Rows Removed by Filter: 27601849
                           Buffers: shared hit=620705 read=445770 written=3
                     ->  Hash  (cost=532646.43..532646.43 rows=1450863 width=12) (actual time=12404.010..12404.010 rows=1455270 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78916kB
                           Buffers: shared hit=208402 read=81547 dirtied=31 written=1809
                           ->  Hash Join  (cost=49728.90..532646.43 rows=1450863 width=12) (actual time=1361.336..11720.243 rows=1455270 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=208402 read=81547 dirtied=31 written=1809
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7253225 width=16) (actual time=0.024..5637.241 rows=7277150 loops=1)
                                       Filter: (o_orderdate < '1995-03-13'::date)
                                       Rows Removed by Filter: 7722850
                                       Buffers: shared hit=174351 read=79171 dirtied=31 written=1809
                                 ->  Hash  (cost=45978.34..45978.34 rows=300045 width=4) (actual time=1358.180..1358.180 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=34051 read=2376
                                       ->  Bitmap Heap Scan on customer  (cost=6949.78..45978.34 rows=300045 width=4) (actual time=182.040..1191.328 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=34051 read=2376
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6874.76 rows=300045 width=0) (actual time=164.936..164.936 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 13.528 ms
 Execution time: 40410.373 ms
(38 rows)

COMMIT;
COMMIT