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 '1995-03-05'
	and l_shipdate > date '1995-03-05'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2765486.15..2765486.18 rows=10 width=20) (actual time=113020.175..113020.179 rows=10 loops=1)
   Buffers: shared hit=1123827 read=244739 written=73
   ->  Sort  (cost=2765486.15..2773446.12 rows=3183989 width=20) (actual time=113020.171..113020.171 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=1123827 read=244739 written=73
         ->  HashAggregate  (cost=2664841.40..2696681.29 rows=3183989 width=20) (actual time=112914.972..112993.989 rows=113242 loops=1)
               Buffers: shared hit=1123821 read=244739 written=73
               ->  Hash Join  (cost=628272.05..2617081.57 rows=3183989 width=20) (actual time=32743.850..112271.395 rows=299121 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1123821 read=244739 written=73
                     ->  Seq Scan on lineitem  (cost=0.00..1833823.98 rows=32838841 width=12) (actual time=0.039..56714.858 rows=32581445 loops=1)
                           Filter: (l_shipdate > '1995-03-05'::date)
                           Rows Removed by Filter: 27402939
                           Buffers: shared hit=832744 read=243584
                     ->  Hash  (cost=609910.67..609910.67 rows=1468910 width=12) (actual time=32741.838..32741.838 rows=1445001 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62090kB
                           Buffers: shared hit=291077 read=1155 written=73
                           ->  Hash Join  (cost=49840.12..609910.67 rows=1468910 width=12) (actual time=1104.068..31793.072 rows=1445001 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=291077 read=1155 written=73
                                 ->  Seq Scan on orders  (cost=0.00..445175.49 rows=7287707 width=16) (actual time=0.017..10948.263 rows=7227311 loops=1)
                                       Filter: (o_orderdate < '1995-03-05'::date)
                                       Rows Removed by Filter: 7772689
                                       Buffers: shared hit=255801
                                 ->  Hash  (cost=46060.87..46060.87 rows=302340 width=4) (actual time=1103.822..1103.822 rows=300441 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10563kB
                                       Buffers: shared hit=35276 read=1155 written=73
                                       ->  Bitmap Heap Scan on customer  (cost=7003.62..46060.87 rows=302340 width=4) (actual time=191.420..950.470 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Buffers: shared hit=35276 read=1155 written=73
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6928.03 rows=302340 width=0) (actual time=179.262..179.262 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1155 written=73
 Total runtime: 113055.793 ms
(35 rows)

COMMIT;
COMMIT