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https://issues.apache.org/jira/browse/LUCENE-3225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054364#comment-13054364
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Simon Willnauer commented on LUCENE-3225:
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looks good +1 to commit! thanks for working on that
> Optimize TermsEnum.seek when caller doesn't need next term
> ----------------------------------------------------------
>
> Key: LUCENE-3225
> URL: https://issues.apache.org/jira/browse/LUCENE-3225
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.0
>
> Attachments: LUCENE-3225.patch, LUCENE-3225.patch
>
>
> Some codecs are able to save CPU if the caller is only interested in
> exact matches. EG, Memory codec and SimpleText can do more efficient
> FSTEnum lookup if they know the caller doesn't need to know the term
> following the seek term.
> We have cases like this in Lucene, eg when IW deletes documents by
> Term, if the term is not found in a given segment then it doesn't need
> to know the ceiling term. Likewise when TermQuery looks up the term
> in each segment.
> I had done this change as part of LUCENE-3030, which is a new terms
> index that's able to save seeking for exact-only lookups, but now that
> we have Memory codec that can also save CPU I think we should commit
> this today.
> The change adds a "boolean onlyExact" param to seek(BytesRef).
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