@comunica/actor-rdf-metadata-extract-hydra-pagesize

Comunica Hydra Pagesize RDF Metadata Extract Actor

An RDF Metadata Extract actor that extract page sizes in the Hydra Core vocabulary.

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-metadata-extract-hydra-pagesize

Metadata entries

This actor adds the following entries to the metadata object.

• pageSize: Value of http://www.w3.org/ns/hydra/core#itemsPerPage.

Configure

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

{
  "@context": [
    ...
    "https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-rdf-metadata-extract-hydra-pagesize/^3.0.0/components/context.jsonld"
  ],
  "actors": [
    ...
    {
      "@id": "urn:comunica:default:rdf-metadata-extract/actors#hydra-pagesize",
      "@type": "ActorRdfMetadataExtractHydraPagesize",
      "predicates": [
        "http://www.w3.org/ns/hydra/core#itemsPerPage"
      ]
    }
  ]
}

Config Parameters

• predicates: The predicates to consider when determining page size, defaults to http://www.w3.org/ns/hydra/core#itemsPerPage.

Changelog

v3.2.0 - 2024-07-05

Added

• Performance improvements:
  • Add optional hash join actor
• Add actors for bindings source attribution
• Add OPT+ operator

Changed

• Performance improvements:
  • Lower default ioWeight to tweak overall performance
  • Make optional hash and bind join only work with common variables
• Debugging and performance tracking:
  • Omit undefined join coefficients in debug logger
  • Emit timings and actual cardinalities in physical explain output
  • Make physical query plan explain output compact and human-readable
  • Compact Bind-Join operations in physical query explain output
  • Add BJ bindOperation to physical query explain output
  • Emit pattern source in physical query explain output

Fixed

• Fix undef sanity check for SPARQL endpoints sometimes going rogue
• Fix CONSTRUCT FROM not being sent to endpoints, Closes #1389
• Fix empty media type not falling back to extension handling
• Fixed the order of count operations influencing the result
• Fix minus-hash using incorrect hash function

<a name="v3.1.2"></a>