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', 'AIR')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1994-01-01'
	and l_receiptdate < date '1994-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=992326.33..992326.34 rows=1 width=27) (actual time=31557.682..31557.683 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=906258 read=460228 dirtied=169 written=199
   ->  HashAggregate  (cost=992326.31..992326.32 rows=1 width=27) (actual time=31557.562..31557.565 rows=2 loops=1)
         Buffers: shared hit=906253 read=460228 dirtied=169 written=199
         ->  Hash Join  (cost=598445.50..987173.04 rows=294473 width=27) (actual time=12797.524..30995.637 rows=311731 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=906253 read=460228 dirtied=169 written=199
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..379525.26 rows=294473 width=15) (actual time=0.165..16915.944 rows=311731 loops=1)
                     Filter: ((l_shipmode = ANY ('{FOB,AIR}'::bpchar[])) AND (l_receiptdate >= '1994-01-01'::date) AND (l_receiptdate < '1995-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6877740
                     Buffers: shared hit=691249 read=418669 dirtied=169 written=155
               ->  Hash  (cost=408509.11..408509.11 rows=15194911 width=20) (actual time=12785.256..12785.256 rows=15000000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 761719kB
                     Buffers: shared hit=215001 read=41559 written=44
                     ->  Seq Scan on orders  (cost=0.00..408509.11 rows=15194911 width=20) (actual time=0.016..5947.215 rows=15000000 loops=1)
                           Buffers: shared hit=215001 read=41559 written=44
 Total runtime: 31670.040 ms
(19 rows)

COMMIT;
COMMIT