Re: Composite index structure

On Mon, Mar 7, 2011 at 2:49 AM, Nick Raj <nickrajjain(at)gmail(dot)com> wrote:

> Hi all,
>
> I want to construct an "Composite Index Structure" i.e. a combination of
> gist and btree.
> What i am thinking is that first creating a Rtree structure that is
> pointing to another Btree structure.
> For example, Suppose i want to find vehicles between 2 to 4 pm on 14/2/2011
> on X road.
>
> I am thinking of creating rtree structure for road network and then btree
> for time. For reaching X road i use Rtree, and from there btree begin i.e.
> leaf node of rtree contains the pointer to root node of btree ( in this way
> i have all time belonging to X road)
>
> My question is that how to implement this composite index structure in
> postgres?
>
> Let us suppose, if i create mygist index, then i have to write my own
> operator class?
> or
> can i use gist index as it is and btree tree as it is. I mean their
> operator class and their gist methods but how to establish linkage between
> them?
>
> Any idea ??
>
> Thanks
> Raj
>

Checkout below links:
http://www.postgresql.org/docs/8.2/static/gist-extensibility.html
http://www.postgresql.org/docs/9.0/interactive/indexam.html

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Chetan Sutrave
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