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https://issues.apache.org/jira/browse/JENA-154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13143065#comment-13143065
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Andy Seaborne commented on JENA-154:
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Stage 1 : ARQ's default execution was getting the wrong answers.
Fix to ARQ applied into SVN for this.
The problem is that use of ?g in GRAPH ?g (mention in FILTER or bind in a
pattern) should.
Use of ?g elsewhere earlier is detected by the optimizer and a non-flow based
join done. But the case of first use in GRAPH ?g was not considered. ?g was
being bound and then the sub-pattern executed.
Instead a lightweight stream join is done after sub-pattern is evaluated. As
this works well for the common case of not having ?g used inside the
subpattern, it is now the default execution pattern. The optimizer scope
tracking does not need to be modified.
Stage 2: investigate TDB usage (quad usage) because that shows erroneous
behavior as well.
> TDB does not manage the scope of a variable in GRAPH ?g correctly.
> ------------------------------------------------------------------
>
> Key: JENA-154
> URL: https://issues.apache.org/jira/browse/JENA-154
> Project: Jena
> Issue Type: Bug
> Components: ARQ, TDB
> Reporter: Andy Seaborne
> Assignee: Andy Seaborne
> Attachments: ReportJena154_GraphVarScope.java
>
>
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