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#55'
	and p_container = 'WRAP JAR'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=391472.11..391472.12 rows=1 width=4) (actual time=1142.788..1142.788 rows=1 loops=1)
   Buffers: shared hit=42409 read=38046 dirtied=403
   ->  Nested Loop  (cost=140.78..391422.81 rows=19719 width=4) (actual time=2.768..1141.181 rows=5102 loops=1)
         Buffers: shared hit=42409 read=38046 dirtied=403
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7701.32 rows=1949 width=4) (actual time=0.295..42.057 rows=1898 loops=1)
               Index Cond: ((p_container = 'WRAP JAR'::bpchar) AND (p_brand = 'Brand#55'::bpchar))
               Heap Fetches: 1898
               Buffers: shared read=1874
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.78 rows=10 width=12) (actual time=0.009..0.012 rows=3 loops=1898)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=12743
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.562..0.562 rows=1 loops=1898)
                       Buffers: shared hit=29666 read=36172 dirtied=403
                       ->  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=0.060..0.546 rows=30 loops=1898)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 57951
                             Buffers: shared hit=29666 read=36172 dirtied=403
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.562..0.562 rows=1 loops=1898)
                       Buffers: shared hit=29666 read=36172 dirtied=403
                       ->  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=0.060..0.546 rows=30 loops=1898)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 57951
                             Buffers: shared hit=29666 read=36172 dirtied=403
 Total runtime: 1143.042 ms
(26 rows)

COMMIT;
COMMIT