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#11'
	and p_container = 'WRAP PKG'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=397679.37..397679.38 rows=1 width=4) (actual time=801.244..801.244 rows=1 loops=1)
   Buffers: shared hit=55184 read=25265 dirtied=47
   ->  Nested Loop  (cost=140.78..397629.73 rows=19855 width=4) (actual time=1.280..800.042 rows=5261 loops=1)
         Buffers: shared hit=55184 read=25265 dirtied=47
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7821.47 rows=1980 width=4) (actual time=0.405..36.359 rows=1918 loops=1)
               Index Cond: ((p_container = 'WRAP PKG'::bpchar) AND (p_brand = 'Brand#11'::bpchar))
               Heap Fetches: 1918
               Buffers: shared read=1897
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.77 rows=10 width=12) (actual time=0.007..0.009 rows=3 loops=1918)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=12971
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.384..0.384 rows=1 loops=1918)
                       Buffers: shared hit=42213 read=23368 dirtied=47
                       ->  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=0.042..0.373 rows=30 loops=1918)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 57638
                             Buffers: shared hit=42213 read=23368 dirtied=47
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.384..0.384 rows=1 loops=1918)
                       Buffers: shared hit=42213 read=23368 dirtied=47
                       ->  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=0.042..0.373 rows=30 loops=1918)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 57638
                             Buffers: shared hit=42213 read=23368 dirtied=47
 Total runtime: 803.709 ms
(26 rows)

COMMIT;
COMMIT