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https://issues.apache.org/jira/browse/LUCENE-3331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125179#comment-13125179
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Michael McCandless commented on LUCENE-3331:
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+1
> 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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