BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	sum(l_extendedprice) / 7.0 as avg_yearly
from
	lineitem,
	part
where
	p_partkey = l_partkey
	and p_brand = 'Brand#52'
	and p_container = 'MED PACK'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                        QUERY PLAN                                                                                         
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=114182.06..114182.07 rows=1 width=4) (actual time=184.033..184.034 rows=1 loops=1)
   Buffers: shared hit=77885 read=4694 dirtied=58
   ->  Nested Loop  (cost=82.71..114131.87 rows=20075 width=4) (actual time=1.540..182.728 rows=5533 loops=1)
         Buffers: shared hit=77885 read=4694 dirtied=58
         ->  Bitmap Heap Scan on part  (cost=72.95..6631.73 rows=2002 width=4) (actual time=1.329..26.748 rows=2060 loops=1)
               Recheck Cond: ((p_container = 'MED PACK'::bpchar) AND (p_brand = 'Brand#52'::bpchar))
               Heap Blocks: exact=2017
               Buffers: shared hit=940 read=1093
               ->  Bitmap Index Scan on part_p_container_p_brand_p_partkey_idx  (cost=0.00..72.45 rows=2002 width=0) (actual time=0.929..0.929 rows=2060 loops=1)
                     Index Cond: ((p_container = 'MED PACK'::bpchar) AND (p_brand = 'Brand#52'::bpchar))
                     Buffers: shared hit=2 read=14
         ->  Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem  (cost=9.76..53.60 rows=10 width=12) (actual time=0.013..0.029 rows=3 loops=2060)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=12562 read=1244
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.044..0.044 rows=1 loops=2060)
                       Buffers: shared hit=64383 read=2357 dirtied=58
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_idx on lineitem lineitem_1  (cost=0.56..9.11 rows=31 width=4) (actual time=0.023..0.038 rows=30 loops=2060)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 372
                             Buffers: shared hit=64383 read=2357 dirtied=58
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.044..0.044 rows=1 loops=2060)
                       Buffers: shared hit=64383 read=2357 dirtied=58
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_idx on lineitem lineitem_1  (cost=0.56..9.11 rows=31 width=4) (actual time=0.023..0.038 rows=30 loops=2060)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 372
                             Buffers: shared hit=64383 read=2357 dirtied=58
 Planning time: 2.300 ms
 Execution time: 184.200 ms
(30 rows)

COMMIT;
COMMIT