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From "Zhang, Lisheng" <Lisheng.Zh...@BroadVision.com>
Subject RE: Boost more recent document
Date Wed, 30 Nov 2011 20:08:44 GMT
Thanks very much for your helps! I got the point, only problem is that
I cannot afford to to use FieldCache because in our app we have many 
lucene index data folders, is there another simple way?

Thanks again, Lisheng

-----Original Message-----
From: Simon Willnauer [mailto:simon.willnauer@googlemail.com]
Sent: Wednesday, November 30, 2011 11:40 AM
To: java-user@lucene.apache.org
Subject: Re: Boost more recent document


On Wed, Nov 30, 2011 at 6:59 PM, Zhang, Lisheng
<Lisheng.Zhang@broadvision.com> wrote:
> Hi,
>
> We need to boost document which is more recent (each doc has time stamp attribute). It
seems that
> we cannot use doc boost at index time because it will be condensed into one byte (cannot
differentiate
> 365 days), so we may use payload (save time stamp as payload) to boost at search time.
>
> In our app we let user enter query at browser and use QueryParser to generate query,
the query can
> be different types (TermQuery, BooleanQuery, WildcardQuery, ...), then it seems we need
to create
> each customized query class similar to PayloadTermQuery, is there another simpler way?

you can simply index your timestamp (untokenzied) and wrap your query
in a CustomScoreQuery. This query accepts your user query and a
ValueSource. During search CustomScoreQuery calls your valuesource for
each document that the user query scores and multiplies the result of
the ValueSource into the score. Inside your valuesource you can simply
get the timestamps from the FieldCache and calculate your custom
boost...

hope that helps

simon
>
> Thanks very much for helps, Lisheng

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