BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	l_shipmode,
	sum(case
		when o_orderpriority = '1-URGENT'
			or o_orderpriority = '2-HIGH'
			then 1
		else 0
	end) as high_line_count,
	sum(case
		when o_orderpriority <> '1-URGENT'
			and o_orderpriority <> '2-HIGH'
			then 1
		else 0
	end) as low_line_count
from
	orders,
	lineitem
where
	o_orderkey = l_orderkey
	and l_shipmode in ('TRUCK', 'FOB')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1996-01-01'
	and l_receiptdate < date '1996-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                          QUERY PLAN                                                                                           
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=990791.58..990791.58 rows=1 width=27) (actual time=26089.592..26089.593 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=936480 read=437110 dirtied=998 written=5456
   ->  HashAggregate  (cost=990791.56..990791.57 rows=1 width=27) (actual time=26089.524..26089.525 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=936475 read=437110 dirtied=998 written=5456
         ->  Hash Join  (cost=597855.79..985647.69 rows=293935 width=27) (actual time=12444.338..25763.052 rows=312210 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=936475 read=437110 dirtied=998 written=5456
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..378606.87 rows=293935 width=15) (actual time=0.098..12812.804 rows=312210 loops=1)
                     Filter: ((l_shipmode = ANY ('{TRUCK,FOB}'::bpchar[])) AND (l_receiptdate >= '1996-01-01'::date) AND (l_receiptdate < '1997-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6877186
                     Buffers: shared hit=834553 read=282722 dirtied=813 written=288
               ->  Hash  (cost=408106.27..408106.27 rows=15179927 width=20) (actual time=12344.060..12344.060 rows=15000000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 892791kB
                     Buffers: shared hit=101919 read=154388 dirtied=185 written=5168
                     ->  Seq Scan on orders  (cost=0.00..408106.27 rows=15179927 width=20) (actual time=0.020..5759.955 rows=15000000 loops=1)
                           Buffers: shared hit=101919 read=154388 dirtied=185 written=5168
 Planning time: 2.821 ms
 Execution time: 26121.021 ms
(21 rows)

COMMIT;
COMMIT