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 ('FOB', 'MAIL')
	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=3034912.34..3034912.34 rows=1 width=27) (actual time=34091.400..34091.401 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=742014 read=583265 dirtied=253 written=1
   ->  HashAggregate  (cost=3034912.32..3034912.33 rows=1 width=27) (actual time=34091.344..34091.345 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=742009 read=583265 dirtied=253 written=1
         ->  Hash Join  (cost=593719.70..3029877.08 rows=287728 width=27) (actual time=9423.038..33762.980 rows=310988 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=742009 read=583265 dirtied=253 written=1
               ->  Seq Scan on lineitem  (cost=0.00..2427165.88 rows=287728 width=15) (actual time=0.217..24008.657 rows=310988 loops=1)
                     Filter: ((l_shipmode = ANY ('{FOB,MAIL}'::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: 59735233
                     Buffers: shared hit=554413 read=516324 written=1
               ->  Hash  (cost=405283.20..405283.20 rows=15074920 width=20) (actual time=9346.209..9346.209 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=187593 read=66941 dirtied=253
                     ->  Seq Scan on orders  (cost=0.00..405283.20 rows=15074920 width=20) (actual time=0.010..4539.898 rows=15015000 loops=1)
                           Buffers: shared hit=187593 read=66941 dirtied=253
 Planning time: 2.185 ms
 Execution time: 34105.496 ms
(21 rows)

COMMIT;
COMMIT