[jira] [Comment Edited] (JENA-1499) The TIM dataset retains a memory of named graphs after deleting all quads.
[
https://issues.apache.org/jira/browse/JENA-1499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16391377#comment-16391377
]
Andy Seaborne edited comment on JENA-1499 at 3/8/18 3:59 PM:
-
The other case is the default in-memory dataset ({{DatasetFactory.create()}}.
It's a one line change to {{DatasetGraphMap.listGraphNodes}} to make not reveal
empty graphs.
{{containsGraph}} already works - it looks for quads not for graph in the map.
(It could be slightly done as an override.)
JENA-1500 and PR#376 (which includes datasets tests including for here).
{noformat}
== plain
Contains: false
– listGraphNodes
(none)
– dump
(empty)
== general
Contains: true
– listGraphNodes
[http://example/g]
– dump
<[http://example/g]> {
}
{noformat}
With PR 374, TIM and TDB are the same as "plain".
was (Author: andy.seaborne):
The other case is the default in-memory dataset ({{DatasetFactory.create()}}.
It's a one line change to {{DatasetGraphMap.listGraphNodes}} to make not reveal
empty graphs.
{{containsGraph}} already works - it looks for quads not for graph in the map.
(It could be slightly done as an override.)
{nofomat}
== default
Contains: false
-- listGraphNodes
(none)
-- dump
(empty)
== general
Contains: true
-- listGraphNodes
http://example/g
-- dump
{
}
{nofomat}
With PR 374, TIM and TDB are the same as "default".
> 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
>Assignee: A. Soroka
>Priority: Minor
>
> 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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[jira] [Comment Edited] (JENA-1499) The TIM dataset retains a memory of named graphs after deleting all quads.
[
https://issues.apache.org/jira/browse/JENA-1499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389757#comment-16389757
]
A. Soroka edited comment on JENA-1499 at 3/7/18 4:25 PM:
-
[~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}}
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}} 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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[jira] [Comment Edited] (JENA-1499) The TIM dataset retains a memory of named graphs after deleting all quads.
[
https://issues.apache.org/jira/browse/JENA-1499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16388781#comment-16388781
]
Adam Jacobs edited comment on JENA-1499 at 3/7/18 12:43 AM:
>From the API side, I've noticed empty graphs are consistently treated as
>"unimportant" and are often created superfluously.
{code:java}
Dataset ds = DatasetFactory.create();
ds.containsNamedModel("foo");
ds.removeNamedModel("bar");
Iterator iterator = ds.listNames();
System.out.println(iterator.next());
System.out.println(iterator.next());{code}
As mentioned, this is significant when serializing to TRIG.
was (Author: jaco0646):
>From the API side, I've noticed empty graphs are consistently treated as
>"unimportant" and are often created superfluously.
{{Dataset ds = DatasetFactory.create();}}
{{ds.containsNamedModel("foo");}}
{{ds.removeNamedModel("bar");}}
{{Iterator iterator = ds.listNames();}}
{{System.out.println(iterator.next());}}
{{System.out.println(iterator.next());}}
As mentioned, this is significant when serializing to TRIG.
> 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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[jira] [Comment Edited] (JENA-1499) The TIM dataset retains a memory of named graphs after deleting all quads.
[
https://issues.apache.org/jira/browse/JENA-1499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16388641#comment-16388641
]
Andy Seaborne edited comment on JENA-1499 at 3/6/18 10:41 PM:
--
Could you explain a bit about what {{QuadTableForm.GSPO.listGraphNodes}} is
doing? I haven't looked at these details of {{QuadTableForm}} before. Can empty
graphs appear in other ways? Does traversal of {{G\?\?\?}} simply on generate
quads if the subtree is partial (i.e. empty) some how in {{GS\?\?}} ?
was (Author: andy.seaborne):
Could you explain a bit about what {{QuadTableForm.GSPO.listGraphNodes}} is
doing? I haven't looked at these details of `QuadTableForm` before. Can empty
graphs appear in other ways? Does traversal of {{G\?\?\?}} simply on generate
quads if the subtree is partial (i.e. empty) some how in {{GS\?\?}} ?
> 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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