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From "paul.elschot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-395) CoordConstrainedBooleanQuery + QueryParser support
Date Tue, 27 Sep 2005 19:26:50 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-395?page=comments#action_12330622 ] 

paul.elschot commented on LUCENE-395:
-------------------------------------

I glanced through the code quickly, I'll give it a try in a week or so.

BooleanScorer2 has one catch for which I did not see a check in the patch:
A) when there is at least one required clause, none of the optional clauses need to match,
but
B) when there are no required clauses, at least one of the optional clauses needs to match.

>From what I saw (very quickly), only case B is implemented,
but what should happen in case A?

Regards,
Paul Elschot

> CoordConstrainedBooleanQuery + QueryParser support
> --------------------------------------------------
>
>          Key: LUCENE-395
>          URL: http://issues.apache.org/jira/browse/LUCENE-395
>      Project: Lucene - Java
>         Type: Improvement
>   Components: Search
>     Versions: unspecified
>  Environment: Operating System: other
> Platform: Other
>     Reporter: Mark Harwood
>     Assignee: Lucene Developers
>     Priority: Minor
>  Attachments: CoordConstrainedBooleanQuery.java, CoordConstrainedBooleanQuery.java, CustomQueryParserExample.java,
CustomQueryParserExample.java, LUCENE-395.patch, TestBooleanMinShouldMatch.java
>
> 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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