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#13'
	and p_container = 'MED BAG'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                               QUERY PLAN                                                                                               
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=364396.58..364396.59 rows=1 width=4) (actual time=436.842..436.842 rows=1 loops=1)
   Buffers: shared hit=73870 read=10313
   ->  Nested Loop  (cost=130.19..364345.26 rows=20525 width=4) (actual time=1.020..435.960 rows=5353 loops=1)
         Buffers: shared hit=73870 read=10313
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.43..8094.68 rows=2051 width=4) (actual time=0.182..25.088 rows=2009 loops=1)
               Index Cond: ((p_container = 'MED BAG'::bpchar) AND (p_brand = 'Brand#13'::bpchar))
               Heap Fetches: 2009
               Buffers: shared hit=12 read=1963
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=129.76..173.60 rows=10 width=12) (actual time=0.004..0.005 rows=3 loops=2009)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13412
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.196..0.196 rows=1 loops=2009)
                       Buffers: shared hit=60446 read=8350
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem lineitem_1  (cost=0.56..129.11 rows=31 width=4) (actual time=0.025..0.189 rows=30 loops=2009)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 60451
                             Buffers: shared hit=60446 read=8350
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.196..0.196 rows=1 loops=2009)
                       Buffers: shared hit=60446 read=8350
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem lineitem_1  (cost=0.56..129.11 rows=31 width=4) (actual time=0.025..0.189 rows=30 loops=2009)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 60451
                             Buffers: shared hit=60446 read=8350
 Planning time: 4.885 ms
 Execution time: 437.099 ms
(27 rows)

COMMIT;
COMMIT