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From Ian Lea <ian....@gmail.com>
Subject Re: How to influence the score in lucene 2.9
Date Thu, 13 May 2010 10:23:23 GMT
An alternative, if you want the date to influence rather than
determine the score, is to use document boosting, with the boost value
set small for old docs and high for new docs.  You would probably need
to play to find suitable values.  One problem would be that a doc that
is recent today will be somewhat older tomorrow.

Another option, more complicated but very flexible, is to use CustomScoreQuery.


--
Ian.


On Wed, May 12, 2010 at 6:21 PM, Erick Erickson <erickerickson@gmail.com> wrote:
> Why wouldn't simply sorting by date descending work in this case? If
> you can detect the situation ahead of time that might be simpler.
>
> Do be aware that sorting by date has its own issues if you've stored
> the dates with very fine resolutions (e.g. seconds), but there are
> well-understood ways of dealing with this.
>
> Best
> Erick
>
> On Wed, May 12, 2010 at 1:04 PM, Gregory Tarr <Gregory.tarr@detica.com>wrote:
>
>> How easy is it to influence the score of search results in lucene 2.9?
>>
>> The situation is that we have a large number of dated documents that
>> match the term "john" but we want to return the latest documents when
>> "john" is the search term.
>>
>> My solution to this would be to override the score such that the score
>> is the number of days since 01/01/1970, the latest documents therefore
>> scoring the highest.
>>
>> How is this possible in the lucene API?
>>
>> Thanks
>>
>> Greg
>>
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