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https://issues.apache.org/jira/browse/JENA-1074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15022115#comment-15022115
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A. Soroka edited comment on JENA-1074 at 11/23/15 1:53 PM:
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Is it absolutely necessary for a {{DatasetGraph}} to support union graph? I'm
no expert on the standards, but the way I understand the dataset concept, there
is no restriction that the number of named graphs be finite. In more practical
terms, I could imagine impl'ing {{DatasetGraph}} over some kind of persistence
where it would be horribly expensive or even truly impossible to iterate over
all the graphs.
was (Author: ajs6f):
Is it absolutely necessary for a `DatasetGraph` to support union graph? I'm no
expert on the standards, but the way I understand the dataset concept, there is
no restriction that the number of named graphs be finite. In more practical
terms, I could imagine impl'ing `DatasetGraph` over some kind of persistence
where it would be horribly expensive or even truly impossible to iterate over
all the graphs.
> Add find operations for DatasetGraph for the union graph.
> ---------------------------------------------------------
>
> Key: JENA-1074
> URL: https://issues.apache.org/jira/browse/JENA-1074
> Project: Apache Jena
> Issue Type: Brainstorming
> Components: ARQ
> Affects Versions: Jena 3.0.0
> Reporter: Andy Seaborne
> Priority: Minor
>
> (This follows on from JENA-1064)
> {{DatasetGraphBaseFind}} now has a {{find}} operations for the union graph
> added to make implementation easier.
> Should operation(s) be exposed in the core interface {{DatasetGraph}} (the
> application contract)? If so, how?
> The operations to consider include:
> * {{findInUnionGraph}} ({{Iterator<Triple>}})
> * {{findQuadsInUnionGraph}} ({{Iterator<Quad>}})
> * {{findInDftGraph}} ({{Iterator<Quad>}} - inconsistent naming with above)
> At the moment {{findInDftGraph}} returns quads and documents
> {{DatasetGraph.getDefaultGraph().find()}} as being the way to get triples.
> This suggests a different style where {{DatasetGraph}} has:
> * {{DatasetGraph.getUnionGraph()}}
> * {{DatasetGraphFind.findInUnionGraph}} ({{Iterator<Quad>}})
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