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[jira] Commented: (LUCENE-395) CoordConstrainedBooleanQuery + QueryParse

Subject: [jira] Commented: (LUCENE-395) CoordConstrainedBooleanQuery + QueryParser support
From: "paul.elschot (JIRA)"
Date: Tue, 1 Nov 2005 23:06:56 +0100 CET
http://issues.apache.org/jira/browse/LUCENE-395?page=comments#action_12356538 ] 

paul.elschot commented on LUCENE-395:

Another way would be to override getBooleanQuery in QueryParser
and check there whether one of the given clauses has a special form,
for example _min2 or _min3  indicating the minimum number of remaining
clauses that should match for this boolean query.

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: BooleanScorer2.java, CoordConstrainedBooleanQuery.java, 
> CoordConstrainedBooleanQuery.java, CustomQueryParserExample.java, 
> CustomQueryParserExample.java, LUCENE-395.patch, LUCENE-395.patch, 
> LUCENE-395.patch, TestBooleanMinShouldMatch.java, 
> TestBooleanMinShouldMatch.java, TestBooleanMinShouldMatch.java, 
> TestBooleanMinShouldMatch.java, 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 Gospodnetić" "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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