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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4100) Maxscore - Efficient Scoring
Date Fri, 13 Oct 2017 14:04:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16203603#comment-16203603
] 

Robert Muir commented on LUCENE-4100:
-------------------------------------

{quote}
Sorry I wrote needsTotalHits because this is the option name I used on the TopScoreDocCollector
factory method, but on the weight we'd need something different. Because there are two situations
in which you would need scores but not visit all matches:
{quote}

I'm not sure thats true. There is another case right? There is the current sorted-index case
today, but you have to be a rocket scientist (custom collector) to use it. Surely the API
should handle that case? (it should "just work" from indexsearcher). 

> 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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