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https://issues.apache.org/jira/browse/LUCENE-3816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13213592#comment-13213592
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Uwe Schindler commented on LUCENE-3816:
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Tha nks for reporting this, I will check and commit trunk and 3.x branch!
> FilteredDocIdSet does not handle a case where the inner set iterator is null
> ----------------------------------------------------------------------------
>
> Key: LUCENE-3816
> URL: https://issues.apache.org/jira/browse/LUCENE-3816
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/search
> Affects Versions: 3.5
> Reporter: Shay Banon
> Assignee: Uwe Schindler
> Attachments: LUCENE-3816.patch
>
>
> DocIdSet#iterator is allowed to return null, when used in FilteredDocIdSet,
> if null is returned from the inner set, the FilteredDocIdSetIterator fails
> since it does not allow for nulls to be passed to it.
> The fix is simple, return null in FilteredDocIdSet in the iterator method is
> the iterator is null.
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