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https://issues.apache.org/jira/browse/LUCENE-2348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14225148#comment-14225148
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Martin Braun commented on LUCENE-2348:
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any update on this? Or should I use lucene grouping for this?
> DuplicateFilter incorrectly handles multiple calls to getDocIdSet for segment
> readers
> -------------------------------------------------------------------------------------
>
> Key: LUCENE-2348
> URL: https://issues.apache.org/jira/browse/LUCENE-2348
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/other
> Affects Versions: 2.9.2
> Reporter: Trejkaz
> Attachments: LUCENE-2348.patch, LUCENE-2348.patch
>
>
> DuplicateFilter currently works by building a single doc ID set, without
> taking into account that getDocIdSet() will be called once per segment and
> only with each segment's local reader.
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