[drupal-devel] nested sets (was menu memory usage)

[vlado]

> Konstantin describes a node hierarchy system powered by nested sets. Thats 
> far more powerful than Ber's relations as described in those links. Nested 
> sets allow you to express complex hierarchies with excellent performance. 
> Thats not true with flat relations table.
> 
> Many of us in Amsterdam discussed nested sets as a promising solution to our 
>   widespread neet for hierarchy. I encourage Konstantin and others to pursue 
> this solution. Book.module is also excellent test case IMO.

I'm compiling a writeup on a variation on the nested set algorithm,
which should help with frequently changed nested sets - to avoid
frequent re-indexing.

I think Aliie, has a prototype of a hirarchy module in her sandbox as
well (vauxia?)

I think it would merit thinking through an approach, where we use
"specialised" indexes for different ordering types like linear, tree,
graph, etc...

Cheers,
Vlado