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https://issues.apache.org/jira/browse/LUCENE-4750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575260#comment-13575260
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Shai Erera commented on LUCENE-4750:
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bq. I don't really like how toString shows impl details (eg, the $facet field
name), vs eg just the CP/s of each drill-down, but I think that's pretty minor
...
That's the current state of the patch anyway. Creating a BQ on-the-fly won't
change it. And I'm not sure if it's bad .. that way, toString shows you the
query that is executed, so e.g. if you indexed into multiple category lists,
you see that right-away. Although, I agree it may be redundant information for
those who index into one category list...
bq. Maybe we could do this if the original query isn't using coord? But maybe
leave this as future TODO optimization
Ok.
> 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
> Assignee: Michael McCandless
> Attachments: LUCENE-4750.patch
>
>
> 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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