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https://issues.apache.org/jira/browse/JENA-40?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990140#comment-12990140
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Benson Margulies commented on JENA-40:
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Removing either of the two OPTIONAL blocks solves the problem of taking forever.
> Query that runs more or less forever
> ------------------------------------
>
> Key: JENA-40
> URL: https://issues.apache.org/jira/browse/JENA-40
> Project: Jena
> Issue Type: Bug
> Components: TDB
> Reporter: Benson Margulies
> Attachments: r.rq, yk.txt
>
>
> Using the data set you have from me, the following query, which looks very
> much like a series of other queries that run quite rapidly, shows no sign of
> finishing.
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