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https://issues.apache.org/jira/browse/JENA-267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13398771#comment-13398771
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Alex Hall commented on JENA-267:
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Is there any requirement that the head come before the bindings in the SPARQL 
results JSON object? As far as I can tell, JSON objects are unordered so it's 
possible that a valid result object have the bindings before the head, which 
might make life difficult for a streaming parser.
                
> 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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