Robert Haas <robertmhaas@gmail.com> writes:
> On Wed, Dec 1, 2010 at 5:22 AM, Dimitri Fontaine <dimitri@2ndquadrant.fr> wrote:
>> IIRC, the goal here was to be able to benefit from KNN GiST from
>> existing GiST indexes as soon as you restart the server with the new
>> code compiled in. I'm not sure it's that important in the context of
>> preparing 9.1. It seems that pg_upgrade already has to issue a reindex
>> script for GiST indexes.
> I don't think Tom was proposing to change the on-disk format, just the API.
Right, AFAIK there is nothing in KNNGIST that would involve an on-disk
data change.
regards, tom lane