Well, I'm not too confident of my JavaCC skills, and when I've messed around with this
stuff in the past, I sometimes ended up inadvertently creating problems in other areas
of the query syntax.
But if, in the future, I or someone else took on this task of enhancing QueryParser,
I'd like to be assured that the underlying Lucene engine will accept and support
negative boosting. Is that the case?
Regards,
Terry
----- Original Message -----
From: Erik Hatcher
To: Lucene Users List
Sent: Wednesday, August 04, 2004 9:12 AM
Subject: Re: Negative Boost
On Aug 4, 2004, at 7:19 AM, Terry Steichen wrote:
> I can't get negative boosts to work with QueryParser. Is it possible
> to do so?
Closer inspection on the parsing:
<Boost> TOKEN : {
<NUMBER: (<_NUM_CHAR>)+ ( "." (<_NUM_CHAR>)+ )? > : DEFAULT
}
where
<#_NUM_CHAR: ["0"-"9"] >
So, no, negative boosts don't appear possible with QueryParser
currently. I have no objections if you'd like to enhance the grammar
to allow for it (provided sufficient unit tests, of course).
Erik
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