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https://issues.apache.org/jira/browse/LUCENE-2590?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-2590:
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Attachment: LUCENE-2590.patch
Attaching a slightly new version of the patch incorporating roughly the idea of
3-distinct methods. Yet, having 3 methods instead of one was kind of ugly to
implement and I didn't want to add switch case statements to visitSubScorer
methods just to call a different method.
Anyway, I changed the 3 parameter methods to take a single argument holding
all required information. This is way more extensible and flexible since we
don't need to change a method signature just to add a new param.
I am not sure about the 3 different callbacks but I thought I would leave it in
the patch for now.
Parent, Child and Scorer became generic arguments.
simon
> Enable access to the freq information in a Query's sub-scorers
> --------------------------------------------------------------
>
> Key: LUCENE-2590
> URL: https://issues.apache.org/jira/browse/LUCENE-2590
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Attachments: LUCENE-2590.patch, LUCENE-2590.patch, LUCENE-2590.patch
>
>
> The ability to gather more details than just the score, of how a given
> doc matches the current query, has come up a number of times on the
> user's lists. (most recently in the thread "Query Match Count" by
> Ryan McV on java-user).
> EG if you have a simple TermQuery "foo", on each hit you'd like to
> know how many times "foo" occurred in that doc; or a BooleanQuery +foo
> +bar, being able to separately see the freq of foo and bar for the
> current hit.
> Lucene doesn't make this possible today, which is a shame because
> Lucene in fact does compute exactly this information; it's just not
> accessible from the Collector.
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