Comunica Inner Multi Index Nested Loop RDF Join Actor

An RDF Join actor that inner-joins 2 or more streams as an index nested loop join.

This actor only applies to sources that can look up operations synchronously (IQuerySource#queryBindingsSynchronous).

This module is part of the Comunica framework, and should only be used by developers that want to build their own query engine.

Click here if you just want to query with Comunica.

Install

$ yarn add @comunica/actor-rdf-join-inner-multi-index-nested-loop
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Configure

After installing, this package can be added to your engine's configuration as follows:

{
  "@context": [
    ...
    "https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-rdf-join-inner-multi-index-nested-loop/^5.0.0/components/context.jsonld"
  ],
  "actors": [
    ...
    {
      "@id": "urn:comunica:default:rdf-join/actors#inner-multi-index-nested-loop",
      "@type": "ActorRdfJoinMultiIndexNestedLoop",
      "mediatorJoinSelectivity": { "@id": "urn:comunica:default:rdf-join-selectivity/mediators#main" },
      "mediatorMergeBindingsContext": { "@id": "urn:comunica:default:merge-bindings-context/mediators#main" }
    }
  ]
}
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Config Parameters

• mediatorJoinSelectivity: A mediator over the RDF Join Selectivity bus.
• mediatorMergeBindingsContext: A mediator over the Merge Bindings Context bus.
• lookupCost: The cost of looking up a single bound operation, expressed in produced rows. (defaults to 1)