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From "Uwe Schindler (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3364) Add score threshold into Scorer.score()
Date Thu, 13 Oct 2011 21:11:11 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13126925#comment-13126925
] 

Uwe Schindler commented on LUCENE-3364:
---------------------------------------

LUCENE-1536 would only help if your filter supports random access and is not too sparse (unless
you override FilteredQuery.useRandomAccess() to always return true). In all other cases, filters
are applied iterative like in previous versions. I just want to mention this.
                
> Add score threshold into Scorer.score()
> ---------------------------------------
>
>                 Key: LUCENE-3364
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3364
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/query/scoring
>            Reporter: John Wang
>
> This is an optimization for scoring.
> Given a Scorer.score() implementation, where features are gathered to calculate a score.
> Proposal, add a parameter to score, e.g. score(float threshold)
> This threshold is the minimum score to "beat" to make it to the current PriorityQueue.
This could potential save a great deal of wasted calculation in the cases where recall is
large.
> In our case specifically, some of the features needed to do calculation can be expensive
to obtain, it would be nice to have a place to decide whether or not even fetching these features
are necessary.
> Also, if we know the score would be low, simply threshold can be returned.
> Let me know if this makes sense and I can work on a patch.

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