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#42'
	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=405094.38..405094.39 rows=1 width=4) (actual time=1112.324..1112.324 rows=1 loops=1)
   Buffers: shared hit=51848 read=30738 dirtied=49
   ->  Nested Loop  (cost=140.78..405043.76 rows=20246 width=4) (actual time=2.547..1110.527 rows=5339 loops=1)
         Buffers: shared hit=51848 read=30738 dirtied=49
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7966.48 rows=2017 width=4) (actual time=0.247..36.229 rows=1961 loops=1)
               Index Cond: ((p_container = 'MED BAG'::bpchar) AND (p_brand = 'Brand#42'::bpchar))
               Heap Fetches: 1961
               Buffers: shared hit=809 read=1125
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.77 rows=10 width=12) (actual time=0.009..0.012 rows=3 loops=1961)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13240
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.529..0.529 rows=1 loops=1961)
                       Buffers: shared hit=37799 read=29613 dirtied=49
                       ->  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=0.052..0.513 rows=30 loops=1961)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59283
                             Buffers: shared hit=37799 read=29613 dirtied=49
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.529..0.529 rows=1 loops=1961)
                       Buffers: shared hit=37799 read=29613 dirtied=49
                       ->  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=0.052..0.513 rows=30 loops=1961)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59283
                             Buffers: shared hit=37799 read=29613 dirtied=49
 Total runtime: 1112.573 ms
(26 rows)

COMMIT;
COMMIT