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https://issues.apache.org/jira/browse/JENA-1499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389708#comment-16389708
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A. Soroka commented on JENA-1499:
---------------------------------
So, I'm fairly sure why this is happening: all the indexes in TIM are of the
form {{Map<Node,Map<Node,Set<Node>>>}}. When a quad is deleted, there is
(currently) no check to see if that {{Set}} ends up empty. An empty {{Set}}
means that there will still be a named graph present with no actual quads--
just as we see. We could add a check in the {{DatasetGraph.delete()}} call
stack so that if the last quad out of a graph is deleted, the {{Node}} =>
(now-empty) {{Set}} mapping is removed from its {{Map}} and if that {{Map}} is
now empty the {{Node}} => {{Map}} mapping is removed from the outermost
{{Map}}. Does that sound like a good move?
> 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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