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https://issues.apache.org/jira/browse/LUCENE-3593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13156934#comment-13156934
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Uwe Schindler commented on LUCENE-3593:
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Opened LUCENE-3595.
> Add a filter returning all document without a value in a field
> --------------------------------------------------------------
>
> Key: LUCENE-3593
> URL: https://issues.apache.org/jira/browse/LUCENE-3593
> Project: Lucene - Java
> Issue Type: New Feature
> Components: core/search
> Affects Versions: 3.6, 4.0
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3593.patch, LUCENE-3593.patch, LUCENE-3593.patch
>
>
> In some situations it would be useful to have a Filter that simply returns
> all document that either have at least one or no value in a certain field. We
> don't have something like that out of the box and adding it seems straight
> forward.
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