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https://issues.apache.org/jira/browse/LUCENE-3212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13055146#comment-13055146
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Michael McCandless commented on LUCENE-3212:
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That's a good point -- I'm not sure why I didn't just override getDeletedDocs!
It seems like that should work fine.
> Supply FilterIndexReader based on any o.a.l.search.Filter
> ---------------------------------------------------------
>
> Key: LUCENE-3212
> URL: https://issues.apache.org/jira/browse/LUCENE-3212
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index, core/search
> Affects Versions: 4.0
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 4.0
>
>
> When coding LUCENE-2919 (PKIndexSplitter), Mike and me had the idea, how to
> effectively apply filters on the lowest level (before query execution). This
> is very useful for e.g. security Filters that simply hide some documents.
> Currently when you apply the filter after searching, lots of useless work was
> done like scoring filtered documents, iterating term positions (for
> Phrases),...
> This patch will provide a FilterIndexReader subclass (4.0 only, 3.x is too
> complicated to implement), that hides filtered documents by returning them in
> getDeletedDocs(). In contrast to LUCENE-2919, the filtering will work on
> per-segment (without SlowMultiReaderWrapper), so per segment search keeps
> available and reopening can be done very efficient, as the filter is only
> calculated on openeing new or changed segments.
> This filter should improve use-cases where the filter can be applied one time
> before all queries (like security filters) on (re-)opening the IndexReader.
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