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https://issues.apache.org/jira/browse/LUCENE-4100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16216916#comment-16216916
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Robert Muir commented on LUCENE-4100:
-------------------------------------
Well that's why i wrote the "note: " :)
Technically the better code would be:
{code}
if (indexOptions = DOCS_ONLY) {
return 1; // tf values are omitted
}
...
{code}
And yes when frequencies are present, according to the docs its allowed to
return -1 here, but that was solely motivated by PreFlexCodec: (Lucene 3.x
indexes). What actually returns -1 here for this case?
We will never have maxScore working as long as we have such complexity: lets
remove the problem. I faced this same issue in LUCENE-7997 and i think its
easier to just enforce that docCount and sumDocFreq are always present, and
that sumTotalTermFreq, and totalTermFreq are always present when term freqs are
stored.
> 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, 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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