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 '1993-04-01'
	and l_shipdate < cast(date '1993-04-01' + interval '1 month' as date);
                                                                                  QUERY PLAN                                                                                  
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1150018.90..1150018.92 rows=1 width=29) (actual time=30879.481..30879.482 rows=1 loops=1)
   Buffers: shared hit=841817 read=266299 written=4489
   ->  Hash Join  (cost=93390.87..1136836.94 rows=753255 width=29) (actual time=1633.485..30410.228 rows=749781 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=841817 read=266299 written=4489
         ->  Bitmap Heap Scan on lineitem  (cost=7868.87..1040016.12 rows=753255 width=12) (actual time=119.205..27924.750 rows=749781 loops=1)
               Recheck Cond: ((l_shipdate >= '1993-04-01'::date) AND (l_shipdate < '1993-05-01'::date))
               Rows Removed by Index Recheck: 59295822
               Heap Blocks: lossy=1067543
               Buffers: shared hit=841808 read=225783 written=4489
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey_brin_idx  (cost=0.00..7680.55 rows=753255 width=0) (actual time=118.420..118.420 rows=10676480 loops=1)
                     Index Cond: ((l_shipdate >= '1993-04-01'::date) AND (l_shipdate < '1993-05-01'::date))
                     Buffers: shared hit=48
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1504.697..1504.697 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=6 read=40516
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.008..857.608 rows=2000000 loops=1)
                     Buffers: shared hit=6 read=40516
 Planning time: 2.456 ms
 Execution time: 30881.935 ms
(20 rows)

COMMIT;
COMMIT