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', 'TRUCK')
	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=989725.47..989725.48 rows=1 width=27) (actual time=37736.281..37736.281 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=546504 read=826188 dirtied=1140 written=34894
   ->  HashAggregate  (cost=989725.45..989725.46 rows=1 width=27) (actual time=37736.153..37736.154 rows=2 loops=1)
         Buffers: shared hit=546499 read=826188 dirtied=1140 written=34894
         ->  Hash Join  (cost=596675.08..984590.39 rows=293432 width=27) (actual time=14566.547..37130.957 rows=312871 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=546499 read=826188 dirtied=1140 written=34894
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..378745.57 rows=293432 width=15) (actual time=0.171..21512.758 rows=312871 loops=1)
                     Filter: ((l_shipmode = ANY ('{AIR,TRUCK}'::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: 6883691
                     Buffers: shared hit=290760 read=826123 dirtied=1140 written=34894
               ->  Hash  (cost=407300.59..407300.59 rows=15149959 width=20) (actual time=14557.208..14557.208 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=255736 read=65
                     ->  Seq Scan on orders  (cost=0.00..407300.59 rows=15149959 width=20) (actual time=0.017..7173.870 rows=15015000 loops=1)
                           Buffers: shared hit=255736 read=65
 Total runtime: 37815.520 ms
(19 rows)

COMMIT;
COMMIT