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Date: Wed, 12 Sep 2012 12:35:07 +1100 (NCT)
From: "Robert Muir (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Commented] (LUCENE-4378) QueryParsers do not support
 negative boosts
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    [ https://issues.apache.org/jira/browse/LUCENE-4378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13453629#comment-13453629 ] 

Robert Muir commented on LUCENE-4378:
-------------------------------------

In my opinion, a better approach is something like the BoostingQuery in lucene/queries for this demoting of terms.

As far as the implementation, I don't particularly like that it goes thru coord(), but we could improve that.

                
> QueryParsers do not support negative boosts
> -------------------------------------------
>
>                 Key: LUCENE-4378
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4378
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Hoss Man
>         Attachments: LUCENE-4378-test.patch
>
>
> Negative query boosts have been supported at the "Query" object level for a long time (resulting in negative scores for matching documents), but evidently we never updated the QueryParsers to know about this - attempting to specify a negative boost in the query string results in a parse error.
> we should probably add this to the parser grammer(s)

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