Just FYI, The largest, most-used knowledge graphs in the world (Google and LinkedIn) are not running on RDF4J or any RDF Triplestore, but on their proprietary graph stores, which also use Datalog as a query language.
For those looking for an enterprise-ready equivalent (also datalog queries) and have a good wad of cash, consider https://www.oxfordsemantic.tech/product
Just FYI, The largest, most-used knowledge graphs in the world (Google and LinkedIn) are not running on RDF4J or any RDF Triplestore, but on their proprietary graph stores, which also use Datalog as a query language.
For those looking for an enterprise-ready equivalent (also datalog queries) and have a good wad of cash, consider https://www.oxfordsemantic.tech/product