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https://issues.apache.org/jira/browse/LUCENE-5327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13817051#comment-13817051
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Uwe Schindler commented on LUCENE-5327:
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DocValues are not really fast with MultiDocValues, because it uses a binary
search to find the document ID.
If you want them on the IndexReader level, use
SlowCompositeReaderWrapper.wrap(yourReader), which exposes all atomic APIs on a
composite reader, too. This is easier to use than MultiDocValues, because it
covers more cases.
There is a reason to differentiate between composite and atomic readers, so
only stuff that can be done on the atomic level natively and fast should be
exposed via IndexReader/CompositeReader. For everything else there are tons of
wrapper APIs. By using them you know, that it might not be the fastest approach.
Please close this issue as won't fix, thanks.
> Expose getNumericDocValues and getBinaryDocValues at toplevel reader and
> searcher levels
> ----------------------------------------------------------------------------------------
>
> Key: LUCENE-5327
> URL: https://issues.apache.org/jira/browse/LUCENE-5327
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 4.5
> Reporter: John Wang
> Attachments: patch.diff
>
>
> Expose NumericDocValues and BinaryDocValues in both IndexReader and
> IndexSearcher apis.
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