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https://issues.apache.org/jira/browse/JENA-261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13396691#comment-13396691
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Claude Warren commented on JENA-261:
------------------------------------
Perhaps I have selected the wrong place to fix the issue I am seing then.
If I do a query
SELECT * WHERE {
{SERVICE silent <A> { ?m a <foo> }}
UNION
{SERVICE silent <B> { ?m a <foo> }}
}
And A has no answers, B has an error (failed service) I get a single empty
result. If I have more services that fail I get as many empty results as there
are failed services. With the patch I get an no solutions (as expected).
Should the solutions with no bindings be filtered out somewhere or should I
just do it in my code?
> QueryIterService returns an empty solution on exception
> -------------------------------------------------------
>
> Key: JENA-261
> URL: https://issues.apache.org/jira/browse/JENA-261
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: ARQ 2.9.0, ARQ 2.9.1
> Reporter: Claude Warren
> Attachments: JENA-261_patch.txt
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> in nextStage() when a RuntimeException is caught and the 'silent' parameter
> has been set, a QueryIterSingleton is created. This results in an empty
> solution being returned. I think the proper action would be to return a
> QueryIterNullIterator so that the empty result is not returned.
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