> this will only work unchanged if the index is unique. imagine , for
> example if you have more than 50 rows with the same value of col.
> one way to fix this is to use ORDER BY col,oid

nope!  oid is
1. deprecated
2. not guaranteed to be unique even inside a (large) table.

Use a sequence instead.  

create view a_b as
        select nextval('some_sequnce')::k, a.*, b.* from a, b [...]

select * from a_b where k > k1 order by k limit 1000
execute fetch_a_b(k1, 1000) <-- pass limit into prepared statement for extra 

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