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https://issues.apache.org/jira/browse/JENA-261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13396751#comment-13396751
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Andy Seaborne commented on JENA-261:
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The SERVICE SILENT is matching and returning a single of no variables.
The fact it "matches" by seeing a failure and returning an empty row is not
visible to UNION. All UNION sees is rows returned.
Don't confuse SERVICE SILENT seeing a a failure and converting it to a result
(that is, it is "matching" in the overall sense) and the branches of the UNION
not matchign (returning zero rows).
> 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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