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 '1997-09-01'
	and l_shipdate < cast(date '1997-09-01' + interval '1 month' as date);
                                                                                  QUERY PLAN                                                                                  
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1152574.27..1152574.29 rows=1 width=29) (actual time=20248.869..20248.869 rows=1 loops=1)
   Buffers: shared hit=1096849 read=22984 dirtied=1061 written=1
   ->  Hash Join  (cost=93280.17..1139581.29 rows=742456 width=29) (actual time=1443.402..19875.844 rows=748402 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=1096849 read=22984 dirtied=1061 written=1
         ->  Bitmap Heap Scan on lineitem  (cost=7758.17..1042922.45 rows=742456 width=12) (actual time=124.441..17852.247 rows=748402 loops=1)
               Recheck Cond: ((l_shipdate >= '1997-09-01'::date) AND (l_shipdate < '1997-10-01'::date))
               Rows Removed by Index Recheck: 59237136
               Heap Blocks: lossy=1079260
               Buffers: shared hit=1056327 read=22981 dirtied=1061 written=1
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey_brin_idx  (cost=0.00..7572.56 rows=742456 width=0) (actual time=123.619..123.619 rows=10792960 loops=1)
                     Index Cond: ((l_shipdate >= '1997-09-01'::date) AND (l_shipdate < '1997-10-01'::date))
                     Buffers: shared hit=23 read=25
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1312.684..1312.684 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=40519 read=3
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.009..624.854 rows=2000000 loops=1)
                     Buffers: shared hit=40519 read=3
 Planning time: 2.535 ms
 Execution time: 20249.999 ms
(20 rows)

COMMIT;
COMMIT