Streaming results for CONSTRUCT queries
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Key: JENA-205
URL: https://issues.apache.org/jira/browse/JENA-205
Project: Jena
Issue Type: Improvement
Components: ARQ, Fuseki
Reporter: Stephen Allen
Assignee: Stephen Allen
Priority: Minor
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.
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