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#52'
	and p_container = 'LG PACK'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                        QUERY PLAN                                                                                         
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=113731.75..113731.76 rows=1 width=4) (actual time=181.371..181.371 rows=1 loops=1)
   Buffers: shared hit=75654 read=4385
   ->  Nested Loop  (cost=82.63..113681.86 rows=19955 width=4) (actual time=2.265..180.292 rows=5298 loops=1)
         Buffers: shared hit=75654 read=4385
         ->  Bitmap Heap Scan on part  (cost=72.87..6610.44 rows=1994 width=4) (actual time=1.956..48.927 rows=2009 loops=1)
               Recheck Cond: ((p_container = 'LG PACK'::bpchar) AND (p_brand = 'Brand#52'::bpchar))
               Heap Blocks: exact=1965
               Buffers: shared read=1980
               ->  Bitmap Index Scan on part_p_container_p_brand_p_partkey_idx  (cost=0.00..72.37 rows=1994 width=0) (actual time=1.614..1.614 rows=2009 loops=1)
                     Index Cond: ((p_container = 'LG PACK'::bpchar) AND (p_brand = 'Brand#52'::bpchar))
                     Buffers: shared read=15
         ->  Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem  (cost=9.76..53.60 rows=10 width=12) (actual time=0.011..0.023 rows=3 loops=2009)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=12786 read=561
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.039..0.039 rows=1 loops=2009)
                       Buffers: shared hit=62868 read=1844
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_idx on lineitem lineitem_1  (cost=0.56..9.11 rows=31 width=4) (actual time=0.022..0.034 rows=30 loops=2009)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 77
                             Buffers: shared hit=62868 read=1844
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.039..0.039 rows=1 loops=2009)
                       Buffers: shared hit=62868 read=1844
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_idx on lineitem lineitem_1  (cost=0.56..9.11 rows=31 width=4) (actual time=0.022..0.034 rows=30 loops=2009)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 77
                             Buffers: shared hit=62868 read=1844
 Planning time: 5.202 ms
 Execution time: 181.660 ms
(30 rows)

COMMIT;
COMMIT