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 '1995-03-29'
	and l_shipdate > date '1995-03-29'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2778278.37..2778278.40 rows=10 width=20) (actual time=85212.590..85212.596 rows=10 loops=1)
   Buffers: shared hit=792708 read=582177 dirtied=253 written=618
   ->  Sort  (cost=2778278.37..2786251.78 rows=3189364 width=20) (actual time=85212.586..85212.589 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=792708 read=582177 dirtied=253 written=618
         ->  HashAggregate  (cost=2677463.72..2709357.36 rows=3189364 width=20) (actual time=85124.762..85191.933 rows=113560 loops=1)
               Buffers: shared hit=792702 read=582177 dirtied=253 written=618
               ->  Hash Join  (cost=633638.39..2629623.26 rows=3189364 width=20) (actual time=28838.618..84610.165 rows=300634 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=792702 read=582177 dirtied=253 written=618
                     ->  Seq Scan on lineitem  (cost=0.00..1842441.31 rows=32439980 width=12) (actual time=0.038..31975.396 rows=32015003 loops=1)
                           Filter: (l_shipdate > '1995-03-29'::date)
                           Rows Removed by Filter: 28029790
                           Buffers: shared hit=516444 read=564938
                     ->  Hash  (cost=614927.80..614927.80 rows=1496847 width=12) (actual time=28836.580..28836.580 rows=1476665 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63451kB
                           Buffers: shared hit=276258 read=17239 dirtied=253 written=618
                           ->  Hash Join  (cost=49737.54..614927.80 rows=1496847 width=12) (actual time=841.619..27240.225 rows=1476665 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=276258 read=17239 dirtied=253 written=618
                                 ->  Seq Scan on orders  (cost=0.00..447376.99 rows=7479622 width=16) (actual time=0.018..7562.565 rows=7384189 loops=1)
                                       Filter: (o_orderdate < '1995-03-29'::date)
                                       Rows Removed by Filter: 7630811
                                       Buffers: shared hit=241084 read=15982 dirtied=253 written=190
                                 ->  Hash  (cost=45985.23..45985.23 rows=300185 width=4) (actual time=841.394..841.394 rows=300441 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10563kB
                                       Buffers: shared hit=35174 read=1257 written=428
                                       ->  Bitmap Heap Scan on customer  (cost=6954.91..45985.23 rows=300185 width=4) (actual time=159.586..675.082 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Buffers: shared hit=35174 read=1257 written=428
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6879.87 rows=300185 width=0) (actual time=143.242..143.242 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1155 written=409
 Total runtime: 85271.850 ms
(35 rows)

COMMIT;
COMMIT