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https://issues.apache.org/jira/browse/LUCENE-6227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14314161#comment-14314161
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Adrien Grand commented on LUCENE-6227:
--------------------------------------
I'll add the suggested comments.
bq. I'm also staring at req() and trying to figure out what happens if we have
only a single, non-scoring clause (yet needsScores=true for the BQ as a whole).
I suppose it falls through to the BoostedScorer case? Maybe we can add a simple
unit test for this case to ensure it does what its supposed to do?
Exactly, it gets a BoostedScorer with a boost of 0. The tests already cover it
(they create a single filter clause and make sure that scores are equal to 0),
but I can make them more explicit.
> Add BooleanClause.Occur.FILTER
> ------------------------------
>
> Key: LUCENE-6227
> URL: https://issues.apache.org/jira/browse/LUCENE-6227
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: Trunk, 5.1
>
> Attachments: LUCENE-6227.patch, LUCENE-6227.patch, LUCENE-6227.patch,
> LUCENE-6227.patch
>
>
> Now that we have weight-level control of whether scoring is needed or not, we
> could add a new clause type to BooleanQuery. It would behave like MUST exept
> that it would not participate in scoring.
> Why do we need it given that we already have FilteredQuery? The idea is that
> by having a single query that performs conjunctions, we could potentially
> take better decisions. It's not ready to replace FilteredQuery yet as
> FilteredQuery has handling of random-access filters that BooleanQuery
> doesn't, but it's a first step towards that direction and eventually
> FilteredQuery would just rewrite to a BooleanQuery.
> I've been calling this new clause type FILTER so far, but feel free to
> propose a better name.
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