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From "Hoss Man (JIRA)" <>
Subject [jira] Commented: (LUCENE-395) CoordConstrainedBooleanQuery + QueryParser support
Date Thu, 06 Oct 2005 20:46:48 GMT
    [ ] 

Hoss Man commented on LUCENE-395:

I freely admit that I didn't give a lot of thought to incrimenting maxCoord.  I did it only
because if I didn't, coordinator.coordFactor() generated ArrayIndexOutOfBoundsExceptions 
-- it assumes that the number of counted matches (nrMatchers) should be used to determine
which element of coordFactor should be used, so I assumed that maxCoord allways needed to
be equal the the maximum number of potential counted matches.

Likewise, I put the code in Coordinator.init() instead of initCountingSumScorer() for the
sole reason that since i was incrimenting maxCoord, I needed to do it before coordFactors[]
was initialized.  (allthough, I suppose it could have happened in initCountingSumScorer(),
prior to the call to coordinator.init()).

Did I mention I'm way over my head as far as this patch goes? ... I don't honestly understand
the meaning/purpose of "coordination" -- I just kind of did what I did because it seemed to
work (and made some sense in the context of hte existing code).

> 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, 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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