Re: GIST index : order Hack : getting the order used by CLUSTER .. USING my_index

Ok,
thank you Tom for this precise answer !

I don't understand how the CLUSTER .. USING index command work then.
It is supposed to rewrite on disk following index order. Does it do nothing
for GIST index?

Cheers,
Rémi-C

2013/10/24 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>

> =?UTF-8?Q?R=C3=A9mi_Cura?= <remi(dot)cura(at)gmail(dot)com> writes:
> > I'm interested in the tree structure inherent to the gist indexing.
> > I was thinking to retrieve it from order of index.
>
> How? A SQL query would have no idea where the index page boundaries were
> in the sequence of retrieved tuples.
>
> > Do you know how I could access it directly?
>
> I don't think there's any way to do that without modifying the GiST code.
> What you really care about here is the contents of the upper index levels,
> which is something that's not exposed at all outside the index AM.
>
> regards, tom lane
>