Arno,

> The question is, is it intresting to add a new index-structure which
> could be used when a user want it. I think it isn't bad to have 2
> index-structures inside a engine, but let's wait for some more
> comments/ideas.

In Fulda I had a talk with Sean about plugin architecture for the
engine and we touched an index structure a little bit.

I would say that we need different indices for different purposes.

For example, I am working with geo data and b-tree is not very usefull
there (simple quad-tree or r-tree give me much more better
performance). Full-text search hardly can be implemented with b-tree
too (inverted file structure give much more better performance). But
these ideas belong to what usually is called "object-relational dbms".

Just my 2 cents

Best regards,
Roman Rokytskyy