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https://issues.apache.org/jira/browse/JENA-97?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13085622#comment-13085622
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Paolo Castagna commented on JENA-97:
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This is another example (as JENA-96) of bug reports which I would like to help 
to fix, but I fail to replicate.
Any help/guidance in replicating this issue is more than welcome. The best 
thing is a small program we can run and debug.

> 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-0.9.0-20110809.130753-7 
>            Reporter: Simon Helsen
>            Priority: Critical
>
> 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 . I suspect they may be caused by 
> the corruptions mentioned in https://issues.apache.org/jira/browse/JENA-91

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