[JENA-205] Streaming results for CONSTRUCT queries

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Done
• Fix Version/s: Jena 2.11.0
• Component/s: ARQ, Fuseki
• Assignee: Stephen Allen
• Reporter: Stephen Allen
• Created: 30/Jan/12 21:55
• Updated: 01/Feb/15 18:56
• Resolved: 01/Feb/15 18:56

Description

It would be useful to have CONSTRUCT queries that streamed results. An additional method on QueryExecution that returned an Iterator<Statement> (or something similar to that [1]) would provide the necessary access.

Implementationwise, the application of Bindings to the CONSTRUCT template is already streaming, we would simply need to perform a distinct operation on the Triples that are created. We could use a DistinctDataNet to get semi-streaming with spill-to-disk functionality.

Additionally, for this to be useful for Fuseki, we also need an RDF/XML serializer that can operate on an Iterator<Statement> instead of a Model.

[1] Prefix mappings would probably be nice for serializers that consume this iterator.

Issue Links

• is related to: JENA-329 Add streaming CONSTRUCT results to Fuseki