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https://issues.apache.org/jira/browse/LUCENE-4580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13508201#comment-13508201
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Shai Erera commented on LUCENE-4580:
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bq. In my opinion, for Lucene 4.x we should move the TermsFilter to core.
This is exactly what I proposed. I'm +1 for it (and BooleanFilter).
bq. TermsFilter is a Disjunction, but for drill downs you generally need
Conjunctions
You're right, it should be a combination of TermsFilter and BooleanFilter. So
in fact if we want to keep DrillDown behave like today, we should use
BooleanFilter and TermsFilter.
> Facet DrillDown should return a Filter not Query
> ------------------------------------------------
>
> Key: LUCENE-4580
> URL: https://issues.apache.org/jira/browse/LUCENE-4580
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Shai Erera
> Priority: Minor
>
> DrillDown is a helper class which the user can use to convert a facet value
> that a user selected into a Query for performing drill-down or narrowing the
> results. The API has several static methods that create e.g. a Term or Query.
> Rather than creating a Query, it would make more sense to create a Filter I
> think. In most cases, the clicked facets should not affect the scoring of
> documents. Anyway, even if it turns out that it must return a Query (which I
> doubt), we should at least modify the impl to return a ConstantScoreQuery.
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