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https://issues.apache.org/jira/browse/JENA-97?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13124424#comment-13124424
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Simon Helsen commented on JENA-97:
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Andy, yes, sorry if I was not clear, but indeed, the same variable appears in 
the iterator of variables more than once. So, do I understand it correctly that 
your fix addresses the duplicate occurrence of variables in the variable 
iterator?
                
> TDB 0.9.0 snapshot sometimes returns a SELECT binding twice
> -----------------------------------------------------------
>
>                 Key: JENA-97
>                 URL: https://issues.apache.org/jira/browse/JENA-97
>             Project: Jena
>          Issue Type: Bug
>          Components: TDB
>         Environment: tx-tdb-0.9.0-20111006.082548-13-dist
>            Reporter: Simon Helsen
>            Assignee: Andy Seaborne
>         Attachments: quads.txt
>
>
> Very sometimes (rare), it seems that a result set will repeat the first 
> SELECT binding. E.g. 
> SELECT ?a ?b ...
> will bind ?a twice in the result set. It only happens quite rarely, but the 
> same queries behave correctly in TDB 0.8.7.

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