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https://issues.apache.org/jira/browse/JENA-1499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389757#comment-16389757
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A. Soroka commented on JENA-1499:
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[~andy.seaborne],
{{org.apache.jena.sparql.core.mem.QuadTableForm.GSPO.listGraphNodes()}} is just
taking the keys of the GSPO index and returning a stream of them. That's why
(see above) if there are mappings fro{{m }}{{Node => Node => Set<Node>}} with
that {{Set}} empty, we're still seeing names of graphs appear at that exact
method.
> The TIM dataset retains a memory of named graphs after deleting all quads.
> --------------------------------------------------------------------------
>
> Key: JENA-1499
> URL: https://issues.apache.org/jira/browse/JENA-1499
> Project: Apache Jena
> Issue Type: Bug
> Affects Versions: Jena 3.6.0
> Reporter: Andy Seaborne
> Priority: Major
>
> Illustration:
> {noformat}
> DatasetGraph dsg = DatasetGraphFactory.createTxnMem();
> Quad q = SSE.parseQuad("(:g :s :p :o)");
> dsg.add(q);
> dsg.delete(q);
> Iter.print(dsg.listGraphNodes());
> {noformat}
> prints {{http://example/g}}.
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