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 ('RAIL', 'FOB')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1993-01-01'
	and l_receiptdate < date '1993-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                                                           QUERY PLAN                                                                                                                            
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=3038186.07..3038186.07 rows=1 width=27) (actual time=33763.689..33763.689 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=887819 read=438771 dirtied=253 written=2
   ->  HashAggregate  (cost=3038186.05..3038186.06 rows=1 width=27) (actual time=33763.639..33763.640 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=887814 read=438771 dirtied=253 written=2
         ->  Hash Join  (cost=594309.84..3033048.40 rows=293580 width=27) (actual time=9333.154..33441.487 rows=312879 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=887814 read=438771 dirtied=253 written=2
               ->  Seq Scan on lineitem  (cost=0.00..2429564.18 rows=293580 width=15) (actual time=0.081..23794.875 rows=312879 loops=1)
                     Filter: ((l_shipmode = ANY ('{RAIL,FOB}'::bpchar[])) AND (l_commitdate < l_receiptdate) AND (l_shipdate < l_commitdate) AND (l_receiptdate >= '1993-01-01'::date) AND (l_receiptdate < '1994-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 59732947
                     Buffers: shared hit=658232 read=413563 written=1
               ->  Hash  (cost=405686.04..405686.04 rows=15089904 width=20) (actual time=9278.656..9278.656 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=229579 read=25208 dirtied=253 written=1
                     ->  Seq Scan on orders  (cost=0.00..405686.04 rows=15089904 width=20) (actual time=0.015..4199.480 rows=15015000 loops=1)
                           Buffers: shared hit=229579 read=25208 dirtied=253 written=1
 Planning time: 2.562 ms
 Execution time: 33768.506 ms
(21 rows)

COMMIT;
COMMIT