Hi,
Thanks for your suggestion, Heikki. Btree_gist module provides Gist implementation for various different data types, equivalent to btree. Correct me if i wrong?
create index ..... using gist (coordinates,time). It will create index on both but i think there would be no linkage between them.
But i want linkage between location and time tree. I want for each location i have Btree like
Rtree root
/ \
non-leaf .......
/ \ \
leaf ...... leaf
| |
Btree root Btree root
/ \ / \
non-leaf
/
leaf
How to create this kind of structure?
What are the modification is required for this?
Thanks
Raj
On Mon, Mar 7, 2011 at 12:33 PM, Heikki Linnakangas
<heikki.linnakangas@enterprisedb.com> wrote:
On 07.03.2011 08:07, Nick Raj wrote:
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?
CREATE INDEX ... USING gist (coordinates, time)
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
