Crate rdf_fusion_execution 

This crate defines the execution engine of RDF Fusion.

RDF Fusion Context

Similar to DataFusion’s SessionContext, RDF Fusion provides an RdfFusionContext. This context manages the state of the RDF Fusion engine, including the registered RDF term encodings. For more details, see the RdfFusionContext documentation.

Executing SPARQL Queries

DataFusion operates on the concept of a logical plan. While DataFusion includes an SQL front-end, it does not provide a SPARQL front-end. To execute SPARQL queries, we convert them into logical plans through the following pipeline:

Query String -> SPARQL Algebra (Oxigraph) -> Logical Plan

The query string is first parsed by Oxigraph’s SPARQL parser, which produces a SPARQL algebra graph pattern. This graph pattern already includes high-level concepts such as Join, Filter, and Projection.

We then convert this algebra pattern into a DataFusion logical plan through a rewriting step. The resulting logical plan is executed by DataFusion.

Modules

results

sparql

SPARQL implementation.

Structs

RdfFusionContext

Represents a connection to an instance of an RDF Fusion engine.