Has there been any thought given to support for quads?

[AndreaWesterinen]

If so, how difficult would this be?

My apologies if there is support already, its definition/code base is not obvious.

[hannahbast]

@AndreaWesterinen We have started working on a very general concept of optionally attaching a "payload" to each entity or triple if needed. That payload is simply data that is carried along when needed for a particular SPARQL query. This enables a number of extensions that we want to have for QLever, in particular: named graphs, precomputed joins, and quads. The precomputed joins boost the performance of queries involving joins with very large predicates, such das rdf:type. They also have the potential to accelerate the SPARQL autocompletion of the QLever UI further.