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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 edited comment on JENA-1499 at 3/7/18 4:25 PM:
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[~andy.seaborne], {{o.a.j.s.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.


was (Author: ajs6f):
[~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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