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https://issues.apache.org/jira/browse/JENA-344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490023#comment-13490023
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Andy Seaborne commented on JENA-344:
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The storage unit DatasetGraphTDB is a graph store so this should be recognized
by the query engine causing the TDB subsystem to directly execute the WHERE
clause.
The graph store / datasetgraph used must be wrapped in some way, hiding the
underlying TDB implementation.
> SPARQL Update WHERE masks the real dataset, making evaluation not respect
> unionGraph.
> -------------------------------------------------------------------------------------
>
> Key: JENA-344
> URL: https://issues.apache.org/jira/browse/JENA-344
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: ARQ 2.9.4
> Reporter: Andy Seaborne
> Assignee: Andy Seaborne
>
> If TDB unionGraph is set, it is not seen because the WHERE is evaluated on
> the graph store (GraphStoreBasic) and that is not recognized by the TDB query
> engine. Hence it uses the general purpose query engine, and fails to honour
> unionGraph.
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