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', 'SHIP')
	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=987196.85..987196.85 rows=1 width=27) (actual time=103201.162..103201.162 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=585325 read=779207 dirtied=761 written=241
   ->  HashAggregate  (cost=987196.83..987196.84 rows=1 width=27) (actual time=103200.973..103200.975 rows=2 loops=1)
         Buffers: shared hit=585320 read=779207 dirtied=761 written=241
         ->  Hash Join  (cost=595494.80..982044.14 rows=294439 width=27) (actual time=26951.853..102309.422 rows=313144 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=585320 read=779207 dirtied=761 written=241
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..377348.13 rows=294439 width=15) (actual time=0.155..73558.666 rows=313144 loops=1)
                     Filter: ((l_shipmode = ANY ('{TRUCK,SHIP}'::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: 6883615
                     Buffers: shared hit=376526 read=732703 dirtied=1 written=192
               ->  Hash  (cost=406494.91..406494.91 rows=15119991 width=20) (actual time=26931.304..26931.304 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=208791 read=46504 dirtied=760 written=49
                     ->  Seq Scan on orders  (cost=0.00..406494.91 rows=15119991 width=20) (actual time=0.036..16930.408 rows=15015000 loops=1)
                           Buffers: shared hit=208791 read=46504 dirtied=760 written=49
 Total runtime: 103394.317 ms
(19 rows)

COMMIT;
COMMIT