On Sun, Aug 8, 2010 at 4:28 PM, Alexander Korotkov <aekorotkov@gmail.com> wrote:
> In gist consitent method support only filtering strategies. For such
> strategies consistent method returns true if subtree can contain matching
> node and false otherwise. Knngist introduce also order by strategies. For
> filtering strategies knngist consistent method returns 0 if subtree can
> contain matching node and -1 otherwise. For order by strategies knngist
> consistent method returns minimal possible distance in subtree. I think we
> can use consistent method with order by strategies not only for ordering but
> also for filtering. If query contain assertion that distance is less than
> some value, than we can call consistent method with order by strategy and
> compare result with query value in order to determine whether scan subtree.
I am not an expert on this code, but after thinking this over, I
believe you are correct and that this is a good point.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company
