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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3331) consider allowing ScorerContext to specify that you dont need freqs/scores
Date Fri, 22 Jul 2011 13:41:57 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13069545#comment-13069545
] 

Uwe Schindler commented on LUCENE-3331:
---------------------------------------

Sounds like a good idea! QueryWrapperFilter can do the same.

> consider allowing ScorerContext to specify that you dont need freqs/scores
> --------------------------------------------------------------------------
>
>                 Key: LUCENE-3331
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3331
>             Project: Lucene - Java
>          Issue Type: Improvement
>    Affects Versions: 4.0
>            Reporter: Robert Muir
>
> This is just an idea for discussion (I have not yet thought everything through: know
of a non-scary way to do the patch yet).
> But I think that it would be useful for ScorerContext to specify something like 'docsOnly',
e.g. ConstantScoreQuery could pass this down here:
> {noformat}
> disi = innerWeight.scorer(context, scorerContext);
> {noformat}
> Basically this flag would specify that the caller does not care about freq() and score(),
and in this case e.g. TermScorer could use a 
> docs-only bulkpostings for example, and never pull freqs. 
> Additionally, it wouldn't need to create a Similarity.DocScorer, which is just wastefully
computing score cache in this case, 
> it could instead pass null, creat a scorer that does not use one, or use a Constant impl
that always returns 1 or throws UOE, 
> depending on how we want to specify that score()/freq() should act if the caller does
actually call it when this flag is set.

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