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From "paul.elschot (JIRA)" <>
Subject [jira] Commented: (LUCENE-395) CoordConstrainedBooleanQuery + QueryParser support
Date Mon, 03 Oct 2005 20:27:48 GMT
    [ ] 

paul.elschot commented on LUCENE-395:

I agree with Yonik here.

> Should these cases be checked in BooleanScorer2, or in BooleanQuery? 

The easiest place is BooleanScorer2 since it already does a lot of checking to decide
which scorers to use. It has this at line 180:
        return new NonMatchingScorer();  // only prohibited scorers
which is a nice fit for the case when minNrShouldMatch is too high.

I'll try the new code in a few days.

> CoordConstrainedBooleanQuery + QueryParser support
> --------------------------------------------------
>          Key: LUCENE-395
>          URL:
>      Project: Lucene - Java
>         Type: Improvement
>   Components: Search
>     Versions: unspecified
>  Environment: Operating System: other
> Platform: Other
>     Reporter: Mark Harwood
>     Assignee: Lucene Developers
>     Priority: Minor
>  Attachments:,,,, LUCENE-395.patch, LUCENE-395.patch,,
> Attached 2 new classes:
> 1) CoordConstrainedBooleanQuery
> A boolean query that only matches if a specified number of the contained clauses
> match. An example use might be a query that returns a list of books where ANY 2
> people from a list of people were co-authors, eg:
> "Lucene In Action" would match ("Erik Hatcher" "Otis Gospodneti&#263;" "Mark Harwood"
> "Doug Cutting") with a minRequiredOverlap of 2 because Otis and Erik wrote that.
> The book "Java Development with Ant" would not match because only 1 element in
> the list (Erik) was selected.
> 2) CustomQueryParserExample
> A customised QueryParser that allows definition of
> CoordConstrainedBooleanQueries. The solution (mis)uses fieldnames to pass
> parameters to the custom query.

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