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 ('AIR', 'FOB')
	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=987690.43..987690.44 rows=1 width=27) (actual time=33514.686..33514.687 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=658040 read=706491 dirtied=254 written=278
   ->  HashAggregate  (cost=987690.41..987690.42 rows=1 width=27) (actual time=33514.538..33514.539 rows=2 loops=1)
         Buffers: shared hit=658035 read=706491 dirtied=254 written=278
         ->  Hash Join  (cost=595494.80..982603.39 rows=290687 width=27) (actual time=14611.054..33029.816 rows=310920 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=658035 read=706491 dirtied=254 written=278
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..378024.62 rows=290687 width=15) (actual time=0.328..17324.117 rows=310920 loops=1)
                     Filter: ((l_shipmode = ANY ('{AIR,FOB}'::bpchar[])) AND (l_receiptdate >= '1997-01-01'::date) AND (l_receiptdate < '1998-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6885839
                     Buffers: shared hit=408114 read=701114 written=278
               ->  Hash  (cost=406494.91..406494.91 rows=15119991 width=20) (actual time=14599.070..14599.070 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=249918 read=5377 dirtied=254
                     ->  Seq Scan on orders  (cost=0.00..406494.91 rows=15119991 width=20) (actual time=0.033..6720.855 rows=15015000 loops=1)
                           Buffers: shared hit=249918 read=5377 dirtied=254
 Total runtime: 33630.235 ms
(19 rows)

COMMIT;
COMMIT