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 ('AIR', 'TRUCK')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1997-01-01'
	and l_receiptdate < date '1997-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                                                            QUERY PLAN                                                                                                                            
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=3059045.50..3059045.50 rows=1 width=27) (actual time=33676.574..33676.575 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=596706 read=739122 written=199
   ->  HashAggregate  (cost=3059045.48..3059045.49 rows=1 width=27) (actual time=33676.526..33676.527 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=596701 read=739122 written=199
         ->  Hash Join  (cost=598445.50..3053978.91 rows=289518 width=27) (actual time=9556.931..33346.759 rows=311193 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=596701 read=739122 written=199
               ->  Seq Scan on lineitem  (cost=0.00..2446485.98 rows=289518 width=15) (actual time=0.031..23413.922 rows=311193 loops=1)
                     Filter: ((l_shipmode = ANY ('{AIR,TRUCK}'::bpchar[])) AND (l_commitdate < l_receiptdate) AND (l_shipdate < l_commitdate) AND (l_receiptdate >= '1997-01-01'::date) AND (l_receiptdate < '1998-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 59674345
                     Buffers: shared hit=433538 read=645722
               ->  Hash  (cost=408509.11..408509.11 rows=15194911 width=20) (actual time=9480.015..9480.015 rows=15000000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 892791kB
                     Buffers: shared hit=163160 read=93400 written=199
                     ->  Seq Scan on orders  (cost=0.00..408509.11 rows=15194911 width=20) (actual time=0.013..4632.020 rows=15000000 loops=1)
                           Buffers: shared hit=163160 read=93400 written=199
 Planning time: 2.193 ms
 Execution time: 33693.126 ms
(21 rows)

COMMIT;
COMMIT