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 '1994-01-01'
	and l_receiptdate < date '1994-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                          QUERY PLAN                                                                                           
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=986173.86..986173.87 rows=1 width=27) (actual time=46406.609..46406.610 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1031830 read=336134 written=952
   ->  HashAggregate  (cost=986173.84..986173.85 rows=1 width=27) (actual time=46406.485..46406.486 rows=2 loops=1)
         Buffers: shared hit=1031825 read=336134 written=952
         ->  Hash Join  (cost=594902.33..981059.54 rows=292246 width=27) (actual time=19236.106..45718.250 rows=311225 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1031825 read=336134 written=952
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..377024.52 rows=292246 width=15) (actual time=0.173..25163.441 rows=311225 loops=1)
                     Filter: ((l_shipmode = ANY ('{TRUCK,FOB}'::bpchar[])) AND (l_receiptdate >= '1994-01-01'::date) AND (l_receiptdate < '1995-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6878454
                     Buffers: shared hit=790460 read=322455 written=418
               ->  Hash  (cost=406090.48..406090.48 rows=15104948 width=20) (actual time=19228.101..19228.101 rows=15000000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 761719kB
                     Buffers: shared hit=241362 read=13679 written=534
                     ->  Seq Scan on orders  (cost=0.00..406090.48 rows=15104948 width=20) (actual time=0.017..9798.014 rows=15000000 loops=1)
                           Buffers: shared hit=241362 read=13679 written=534
 Total runtime: 46543.210 ms
(19 rows)

COMMIT;
COMMIT