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https://issues.apache.org/jira/browse/JENA-1158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15213432#comment-15213432
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Andy Seaborne commented on JENA-1158:
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See also {{DynamicDataset}} which includes an option for a union default graph.
It currently uses {{GraphUnionRead}} for the union.
This could be improved with JENA-1074.
Better would be to have unionDefaultGraph implemented in the {{DatasetGraph}}
framework so implementations can do a better job than a default mechanism if
they can.
JENA-642 appears to do the distinct reduction in the wrong place (on BGP, not
on each triple pattern).
> Provide unionDefaultGraph for all graghs.
> -----------------------------------------
>
> Key: JENA-1158
> URL: https://issues.apache.org/jira/browse/JENA-1158
> Project: Apache Jena
> Issue Type: Improvement
> Components: ARQ
> Affects Versions: Jena 3.0.1
> Reporter: Andy Seaborne
>
> Provide "unionDefaultGraph" for all graphs.
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