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From "Doron Cohen (JIRA)" <>
Subject [jira] Commented: (LUCENE-1608) CustomScoreQuery should support arbitrary Queries
Date Wed, 22 Apr 2009 21:10:47 GMT


Doron Cohen commented on LUCENE-1608:

I thought I had written a class exactly for this purpose but I was wrong - my class was different
in that it had an actual value source, just that it was sparse - values for quite many docs
were missing. It is similar in a way, but different since here the input is a query.

But I did promise... so I wrote a quick wrapper for a query to create a value source.
That value source can be used to create a value source query.

Although the patch coming soon is tested and all, I am not considering to commit this patch,
because it is not clean. 

I would like to reorganize this package to take better care of this request and other related
issues (like LUCENE-850) and to make it worth for Solr to move to use this package. (last
time I checked it wasn't). But this is a different issue...

> CustomScoreQuery should support arbitrary Queries
> -------------------------------------------------
>                 Key: LUCENE-1608
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Query/Scoring
>            Reporter: Steven Bethard
>            Assignee: Doron Cohen
>            Priority: Minor
> CustomScoreQuery only allows the secondary queries to be of type ValueSourceQuery instead
of allowing them to be any type of Query. As a result, what you can do with CustomScoreQuery
is pretty limited.
> It would be nice to extend CustomScoreQuery to allow arbitrary Query objects. Most of
the code should stay about the same, though a little more care would need to be taken in CustomScorer.score()
to use 0.0 when the sub-scorer does not produce a score for the current document.

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