BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	100.00 * sum(case
		when p_type like 'PROMO%'
			then l_extendedprice * (1 - l_discount)
		else 0
	end) / sum(l_extendedprice * (1 - l_discount)) as promo_revenue
from
	lineitem,
	part
where
	l_partkey = p_partkey
	and l_shipdate >= date '1995-11-01'
	and l_shipdate < cast(date '1995-11-01' + interval '1 month' as date);
                                                                                  QUERY PLAN                                                                                  
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1145389.35..1145389.36 rows=1 width=29) (actual time=27127.028..27127.029 rows=1 loops=1)
   Buffers: shared hit=572672 read=535444 written=6014
   ->  Hash Join  (cost=93290.59..1132378.57 rows=743473 width=29) (actual time=1633.189..26670.451 rows=748601 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=572672 read=535444 written=6014
         ->  Bitmap Heap Scan on lineitem  (cost=7768.59..1035704.47 rows=743473 width=12) (actual time=119.641..24322.912 rows=748601 loops=1)
               Recheck Cond: ((l_shipdate >= '1995-11-01'::date) AND (l_shipdate < '1995-12-01'::date))
               Rows Removed by Index Recheck: 59297002
               Heap Blocks: lossy=1067543
               Buffers: shared hit=570745 read=496846 written=6014
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey_brin_idx  (cost=0.00..7582.73 rows=743473 width=0) (actual time=118.813..118.813 rows=10676480 loops=1)
                     Index Cond: ((l_shipdate >= '1995-11-01'::date) AND (l_shipdate < '1995-12-01'::date))
                     Buffers: shared hit=48
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1503.602..1503.602 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=1924 read=38598
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.013..851.437 rows=2000000 loops=1)
                     Buffers: shared hit=1924 read=38598
 Planning time: 2.082 ms
 Execution time: 27129.586 ms
(20 rows)

COMMIT;
COMMIT