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 '1997-06-01'
	and l_shipdate < cast(date '1997-06-01' + interval '1 month' as date);
                                                                                  QUERY PLAN                                                                                  
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1146942.45..1146942.47 rows=1 width=29) (actual time=25849.847..25849.847 rows=1 loops=1)
   Buffers: shared hit=635464 read=479024 written=3786
   ->  Hash Join  (cost=93235.21..1134026.24 rows=738069 width=29) (actual time=1674.048..25403.248 rows=748947 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=635464 read=479024 written=3786
         ->  Bitmap Heap Scan on lineitem  (cost=7713.21..1037433.21 rows=738069 width=12) (actual time=120.468..23080.257 rows=748947 loops=1)
               Recheck Cond: ((l_shipdate >= '1997-06-01'::date) AND (l_shipdate < '1997-07-01'::date))
               Rows Removed by Index Recheck: 59295717
               Heap Blocks: lossy=1073915
               Buffers: shared hit=632542 read=441421 written=3740
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey_brin_idx  (cost=0.00..7528.69 rows=738069 width=0) (actual time=119.669..119.669 rows=10739200 loops=1)
                     Index Cond: ((l_shipdate >= '1997-06-01'::date) AND (l_shipdate < '1997-07-01'::date))
                     Buffers: shared hit=13 read=35
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1547.383..1547.383 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=2919 read=37603 written=46
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.008..910.884 rows=2000000 loops=1)
                     Buffers: shared hit=2919 read=37603 written=46
 Planning time: 2.930 ms
 Execution time: 25850.735 ms
(20 rows)

COMMIT;
COMMIT