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https://issues.apache.org/jira/browse/LUCENE-4750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13570360#comment-13570360
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Uwe Schindler commented on LUCENE-4750:
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Mike: Yes, you dont need to implement createWeiggt. That was always like this,
there are lots of queries shipped with Lucene that have no weight (e.g. MTQ).
The Query base class handles all of this.
> Convert DrillDown to DrillDownQuery
> -----------------------------------
>
> Key: LUCENE-4750
> URL: https://issues.apache.org/jira/browse/LUCENE-4750
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Shai Erera
>
> DrillDown is a utility class for creating drill-down queries over a base
> query and a bunch of categories. We've been asked to support AND, OR and AND
> of ORs. The latter is not so simple as a static utility method though, so
> instead we have some sample code ...
> Rather, I think that we can just create a DrillDownQuery (extends Query)
> which takes a baseQuery in its ctor and exposes add(CategoryPath...), such
> that every such group of categories is AND'ed with other groups, and
> internally they are OR'ed. It's very similar to how you would construct a
> BooleanQuery, only simpler and specific to facets.
> Internally, it would build a BooleanQuery and delegate rewrite, createWeight
> etc to it.
> That will remove the need for the static utility methods .. or we can keep
> static term() for convenience.
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