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=990111.62..990111.62 rows=1 width=27) (actual time=52569.141..52569.141 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=736095 read=629665 dirtied=253 written=234
   ->  HashAggregate  (cost=990111.60..990111.61 rows=1 width=27) (actual time=52569.010..52569.011 rows=2 loops=1)
         Buffers: shared hit=736090 read=629665 dirtied=253 written=234
         ->  Hash Join  (cost=597265.22..984964.38 rows=294127 width=27) (actual time=18981.696..51858.865 rows=312912 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=736090 read=629665 dirtied=253 written=234
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..378507.69 rows=294127 width=15) (actual time=0.313..31289.687 rows=312912 loops=1)
                     Filter: ((l_shipmode = ANY ('{RAIL,FOB}'::bpchar[])) AND (l_receiptdate >= '1993-01-01'::date) AND (l_receiptdate < '1994-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6883670
                     Buffers: shared hit=494036 read=615662 written=228
               ->  Hash  (cost=407703.43..407703.43 rows=15164943 width=20) (actual time=18970.145..18970.145 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=242051 read=14003 dirtied=253 written=6
                     ->  Seq Scan on orders  (cost=0.00..407703.43 rows=15164943 width=20) (actual time=0.021..8849.761 rows=15015000 loops=1)
                           Buffers: shared hit=242051 read=14003 dirtied=253 written=6
 Total runtime: 52718.697 ms
(19 rows)

COMMIT;
COMMIT