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https://issues.apache.org/jira/browse/JENA-267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13398780#comment-13398780
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Rob Vesse commented on JENA-267:
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Technically speaking no - the spec [1] certainly doesn't require it. In
reality I would expect that any sensible producer of the format is always going
to put the head element first.
One thing we can do is read and see if a head key is present as the first key,
if not then we revert to the read everything into memory behavior.
[1]: http://www.w3.org/TR/sparql11-results-json/
> SPARQL JSON Parser is not streaming
> -----------------------------------
>
> Key: JENA-267
> URL: https://issues.apache.org/jira/browse/JENA-267
> Project: Apache Jena
> Issue Type: Improvement
> Components: ARQ
> Affects Versions: ARQ 2.9.1
> Reporter: Rob Vesse
> Assignee: Rob Vesse
> Labels: json, sparql
>
> The current SPARQL JSON parser in ARQ parses the JSON by parsing the entire
> response into a in-memory data structure and then iterating over that. So
> for large results it is trivial to hit an OutOfMemory exception.
> This task is to reimplement the SPARQL JSON parser to be fully streaming in
> its implementation in line with all the other results parsers
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