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From "Juan Grande (Updated) (JIRA)" <>
Subject [jira] [Updated] (LUCENE-3833) Add an operator to query parser for term quorum (ie: BooleanQuery.setMinimumNumberShouldMatch)
Date Tue, 27 Mar 2012 21:22:26 GMT


Juan Grande updated LUCENE-3833:

    Attachment: LUCENE-3833.patch


I'm attaching a patch that implements this feature for the classic query parser in the trunk.
I'm still working on a solution for the flexible.standard implementation.

The syntax is the same as for sloppy phrases. Some things need to be decided:
* What should happen when this is applied to something that isn't a boolean query? For example:
([* TO *])~3. In this case, the patch simply ignores the mm.
* Because in the grammar definition I'm using the same production as for sloppy phrases, decimal
values are allowed by the syntax. What should we do when the user enters a non-integer number?
Throw a ParseException maybe? Currently, the patch also ignores the mm value in this case.

I don't really know much about JavaCC, I just learnt the basics to do the patch, so feel free
to correct any possible mistakes.

In this patch I'm removing a constructor that was manually added to ParseException, so it
doesn't fail when the sources are regenerated.

-- Juan

> Add an operator to query parser for term quorum (ie: BooleanQuery.setMinimumNumberShouldMatch)
> ----------------------------------------------------------------------------------------------
>                 Key: LUCENE-3833
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: core/queryparser
>            Reporter: Mike
>         Attachments: LUCENE-3833.patch
>   Original Estimate: 2h
>  Remaining Estimate: 2h
> A project I'm working on requires *term quorum* searching with stemming turned off. The
users are accostomed to Sphinx search, and thus expect a query like [ A AND (B C D)/2 ] to
return only documents that contain A or at least two of B, C or D. 
> So this document would match:
> a b c
> But this one wouldn't:
> a b
> This can be a useful form of fuzzy searching, and I think we support it via the MM parameter,
but we lack a user-facing operator for this. It would be great to add it.

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