consider allowing ScorerContext to specify that you dont need freqs/scores
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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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