Re: Creating GiST Indices?

Thanks for the help. I was near insanity trying to figure out the meaning of
the error codes and fine some docs. The docs are a bit misleading, I guess,
as they sort of say "you can use btrees, rtrees and GiST", but don't
mention that you need to actually do something special to get GiST working.

Anyway, I'll take a look at the docs you mentioned and play around with the
code in contrib/tsearch. It's something close to what I'm looking for...

Thx.

J


Tom Lane wrote:

> J Smith <dark_panda@hushmail.com> writes:
>> This basically went on for hours. I've tried text_ops based on what I can
>> see in the pg_class table and a bunch of other stuff, but I can't create
>> GiST indexes. (Or rather, I don't know how to.)
>
> The reason you're not getting anywhere is that there aren't any GiST
> operator classes in the standard distribution; thus, no way to apply
> the GiST code to any datatype.
>
> The various contrib modules that make use of GiST create custom operator
> classes --- and, in many cases, custom datatypes as well for the custom
> opclasses to work on.
>
> You're right that this is all very poorly documented.  Making new index
> opclasses will probably always be a task for wizards, but it'd be nice
> if there were more info in the docs about it :-(.  You can try reading
> the presentation in the 7.3 devel docs:
> http://developer.postgresql.org/docs/postgres/xindex.html
> but note that that does not apply to prior releases; if you actually
> want to try this in a current release, next read
> http://www.ca.postgresql.org/users-lounge/docs/7.2/postgres/xindex.html
> to see the ugly manual procedure that CREATE OPERATOR CLASS replaces.
>
> regards, tom lane
>
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