Materialized joins

[mcollina]

As @dominictarr suggested in #4 :

a join is also a relationship on it's own, maybe it could return results in the {subject, object, predicate} triple also?

what about:

{ subject: 'daniele', object: 'marco', predicate: 'friend-of-friend' },
{ subject: 'daniele', object: 'matteo', predicate: 'friend-of-friend' },
{ subject: 'lucio', object: 'marco', predicate: 'friend-of-friend' },
{ subject: 'lucio', object: 'matteo', predicate: 'friend-of-friend' }

then, potentially, you could materialize these, or use them as parts of other joins?

An option might be something like:

db.materialize(conditions, 
{ subject: db.var("s"), predicate: db.var("p"), object: db.var("o") } , ....

[mcollina]

This has been published with #4.