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 ('REG AIR', '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=983898.71..983898.72 rows=1 width=27) (actual time=32493.521..32493.523 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=401606 read=961358 dirtied=945 written=50954
   ->  HashAggregate  (cost=983898.69..983898.70 rows=1 width=27) (actual time=32493.410..32493.411 rows=2 loops=1)
         Buffers: shared hit=401601 read=961358 dirtied=945 written=50954
         ->  Hash Join  (cost=593129.56..978821.87 rows=290104 width=27) (actual time=13174.793..32049.062 rows=312660 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=401601 read=961358 dirtied=945 written=50954
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..376626.56 rows=290104 width=15) (actual time=0.354..17488.081 rows=312660 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",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: 6884523
                     Buffers: shared hit=147324 read=961351 dirtied=945 written=50954
               ->  Hash  (cost=404880.36..404880.36 rows=15059936 width=20) (actual time=13158.712..13158.712 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=254274 read=7
                     ->  Seq Scan on orders  (cost=0.00..404880.36 rows=15059936 width=20) (actual time=0.025..5581.684 rows=15015000 loops=1)
                           Buffers: shared hit=254274 read=7
 Total runtime: 32676.114 ms
(19 rows)

COMMIT;
COMMIT