[jira] [Resolved] (JENA-205) Streaming results for CONSTRUCT queries

["Stephen Allen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JENA-205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephen Allen resolved JENA-205.
--------------------------------

    Resolution: Fixed

Streaming CONSTRUCT queries are now supported at an API level.  Therefore this issue is FIXED.

There is a related issue of allowing Fuseki to stream the results back to the client.  That is tracked in JENA-329.
                
> Streaming results for CONSTRUCT queries
> ---------------------------------------
>
>                 Key: JENA-205
>                 URL: https://issues.apache.org/jira/browse/JENA-205
>             Project: Apache 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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