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https://issues.apache.org/jira/browse/LUCENE-6022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14182921#comment-14182921
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Adrien Grand commented on LUCENE-6022:
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I agree this thing could be merged with FilteredDocIdSet. The only additional
thing it has is the optimization when deleted docs are a bit set but I'm
wondering if it really helps in practice given that we try to merge more
agressively segments that have lots of deleted documents.
> DocValuesDocIdSet: check deleted docs before doc values
> -------------------------------------------------------
>
> Key: LUCENE-6022
> URL: https://issues.apache.org/jira/browse/LUCENE-6022
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Trivial
> Fix For: 5.0
>
> Attachments: LUCENE-6022.patch
>
>
> When live documents are not null, DocValuesDocIdSet checks if doc values
> match the document before the live docs. Given that checking if doc values
> match could involve a heavy computation (eg. geo distance) and that the
> default codec has live docs in memory but doc values on disk, I think it
> makes more sense to check live docs first?
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