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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2590) Enable access to the freq information in a Query's sub-scorers
Date Sun, 29 Aug 2010 10:30:58 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903952#action_12903952
] 

Michael McCandless commented on LUCENE-2590:
--------------------------------------------

{quote}
One way of doing it would be adding the scorers Weight as a protected final member since Weight
already has a #getQuery() method we can easily access it or throw an UnsupportedOperationException
if the weight is null (force it via ctor and have a default one which sets it to null).
{quote}

+1

This would then make a default base impl work well for all leaf queries.

> 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: Simon Willnauer
>         Attachments: LUCENE-2590.patch, 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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