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https://issues.apache.org/jira/browse/LUCENE-6633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14608004#comment-14608004
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ASF subversion and git services commented on LUCENE-6633:
---------------------------------------------------------

Commit 1688409 from [~jpountz] in branch 'dev/trunk'
[ https://svn.apache.org/r1688409 ]

LUCENE-6633: Remove DuplicateFilter.

> Remove DuplicateFilter
> ----------------------
>
>                 Key: LUCENE-6633
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6633
>             Project: Lucene - Core
>          Issue Type: Task
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>             Fix For: 5.3
>
>         Attachments: LUCENE-6633.patch
>
>
> DuplicateFilter is a filter which aims at only exposing a single document per 
> unique field value. It has some flaws, for instance it only works if you have 
> a single leaf and we now have a better way to handle this use-case with 
> DiversifiedTopDocsCollector. So I suggest that we just remove it and 
> recommend users to use DiversifiedTopDocsCollector instead.



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