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 '1996-02-01'
	and l_shipdate < cast(date '1996-02-01' + interval '1 month' as date);
                                                                                  QUERY PLAN                                                                                  
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1147192.09..1147192.11 rows=1 width=29) (actual time=24814.744..24814.744 rows=1 loops=1)
   Buffers: shared hit=845477 read=269011 written=4778
   ->  Hash Join  (cost=93240.42..1134266.99 rows=738577 width=29) (actual time=1698.237..24394.292 rows=722599 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=845477 read=269011 written=4778
         ->  Bitmap Heap Scan on lineitem  (cost=7718.42..1037666.34 rows=738577 width=12) (actual time=119.898..22042.502 rows=722599 loops=1)
               Recheck Cond: ((l_shipdate >= '1996-02-01'::date) AND (l_shipdate < '1996-03-01'::date))
               Rows Removed by Index Recheck: 59322065
               Heap Blocks: lossy=1073915
               Buffers: shared hit=842063 read=231900 written=476
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey_brin_idx  (cost=0.00..7533.77 rows=738577 width=0) (actual time=119.152..119.152 rows=10739200 loops=1)
                     Index Cond: ((l_shipdate >= '1996-02-01'::date) AND (l_shipdate < '1996-03-01'::date))
                     Buffers: shared hit=48
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1572.130..1572.130 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=3411 read=37111 written=4302
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.008..949.842 rows=2000000 loops=1)
                     Buffers: shared hit=3411 read=37111 written=4302
 Planning time: 2.393 ms
 Execution time: 24815.609 ms
(20 rows)

COMMIT;
COMMIT