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#44'
	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=401483.04..401483.05 rows=1 width=4) (actual time=1395.618..1395.618 rows=1 loops=1)
   Buffers: shared hit=50174 read=35613 dirtied=67
   ->  Nested Loop  (cost=140.78..401432.92 rows=20045 width=4) (actual time=1.273..1393.627 rows=5497 loops=1)
         Buffers: shared hit=50174 read=35613 dirtied=67
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7894.14 rows=1999 width=4) (actual time=0.288..46.857 rows=2052 loops=1)
               Index Cond: ((p_container = 'MED PACK'::bpchar) AND (p_brand = 'Brand#44'::bpchar))
               Heap Fetches: 2052
               Buffers: shared hit=381 read=1631
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.77 rows=10 width=12) (actual time=0.017..0.021 rows=3 loops=2052)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13744
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.629..0.629 rows=1 loops=2052)
                       Buffers: shared hit=36049 read=33982 dirtied=67
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.69 rows=31 width=4) (actual time=0.066..0.611 rows=30 loops=2052)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61514
                             Buffers: shared hit=36049 read=33982 dirtied=67
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.629..0.629 rows=1 loops=2052)
                       Buffers: shared hit=36049 read=33982 dirtied=67
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.69 rows=31 width=4) (actual time=0.066..0.611 rows=30 loops=2052)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61514
                             Buffers: shared hit=36049 read=33982 dirtied=67
 Total runtime: 1395.887 ms
(26 rows)

COMMIT;
COMMIT