limit is sometimes not pushed in view with order

I was investigating some performance issues and stumbled upon this behavior:

create table main_table (i serial primary key, data varchar, ord int);
create view main_view_order as select m.i, m.data, m.ord from main_table m order by m.i desc;

insert into main_table select i, i::text, i/10 from generate_series(1,1000000) i;

create index ix_ord on main_table(ord);
analyze main_table;

explain analyze select * from main_view_order m where m.ord >= 5000 and m.ord <= 5500 limit 10;

Limit  (cost=0.00..69.01 rows=10 width=14) (actual time=330.943..330.951 rows=10 loops=1)
  ->  Index Scan Backward using main_table_pkey on main_table m  (cost=0.00..36389.36 rows=5281 width=14) (actual
time=330.937..330.940rows=10 loops=1) 
        Filter: ((ord >= 5000) AND (ord <= 5500))
Total runtime: 330.975 ms

I havent found it on TODO or in archives so I'm wondering if this is a known behavior.

Regards,
Rikard

--
Rikard Pavelic
http://www.ngs.hr/