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https://issues.apache.org/jira/browse/LUCENE-4378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13453592#comment-13453592
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Yonik Seeley commented on LUCENE-4378:
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bq. I don't think it would be good to add to the grammar: its significantly
trappy and I can't think of any actual use cases,
We're back to the general problem of prohibiting things that some people don't
see use cases for. We should really try to avoid this.
Can you expand on what you mean by "trappy"? I don't see anyone accidentally
using a negative boost when they didn't mean to.
> 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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