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https://issues.apache.org/jira/browse/LUCENE-4100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16203051#comment-16203051
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Robert Muir commented on LUCENE-4100:
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Can we avoid the ScoreMode.merge? This seems really, really confusing. In
general I don't think we should support such merging in MultiCollector or
anywhere else, we should simply throw exception if things are different.
I think the enum should be further revisited/simplified: essentially at the
minimum it must capture 2 booleans from the user: whether scores are needed,
and whether exact total hit count is needed. Perhaps instead of the enum two
booleans would be easier for now.
I don't understand why we should set the totalHitCount to -1, vs setting to a
useful approximation, like google. The user said they didn't need the exact
total hit count, so it should be no surprise, and its a hell of a lot more
useful than a negative number.
> Maxscore - Efficient Scoring
> ----------------------------
>
> Key: LUCENE-4100
> URL: https://issues.apache.org/jira/browse/LUCENE-4100
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/codecs, core/query/scoring, core/search
> Affects Versions: 4.0-ALPHA
> Reporter: Stefan Pohl
> Labels: api-change, gsoc2014, patch, performance
> Fix For: 4.9, 6.0
>
> Attachments: LUCENE-4100.patch, LUCENE-4100.patch,
> contrib_maxscore.tgz, maxscore.patch
>
>
> At Berlin Buzzwords 2012, I will be presenting 'maxscore', an efficient
> algorithm first published in the IR domain in 1995 by H. Turtle & J. Flood,
> that I find deserves more attention among Lucene users (and developers).
> I implemented a proof of concept and did some performance measurements with
> example queries and lucenebench, the package of Mike McCandless, resulting in
> very significant speedups.
> This ticket is to get started the discussion on including the implementation
> into Lucene's codebase. Because the technique requires awareness about it
> from the Lucene user/developer, it seems best to become a contrib/module
> package so that it consciously can be chosen to be used.
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