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From Shawn Heisey <>
Subject Re: Solr date "NOW" - format?
Date Wed, 18 Aug 2010 04:21:15 GMT
  My first attempt was adding this to the dismax handler:

<str name="bq">pd:[NOW-1MONTH TO NOW]^5.0</str>
<str name="bq">pd:[NOW-3MONTHS TO NOW-1MONTH]^3.0</str>
<str name="bq">pd:[NOW-1YEAR TO NOW-3MONTHS]^2.0</str>
<str name="bq">pd:[* TO NOW-1YEAR]^1.0</str>

This results in scores that are quite a bit lower (9.5 max score instead 
of 11.7), but the order looks the same.  No real change other than a 
higher max score (10) if I leave only the first bq entry.

I wasn't able to figure out a way to put all the ranges in one bq, 
everything I tried got zero results.

What am I doing wrong?

On 8/17/2010 8:36 PM, Shawn Heisey wrote:
>  Would I do separate bq values for each of the ranges, or is there a 
> way to include them all at once?  If it's the latter, I'll need a full 
> example with a field name, because I'm clueless. :)
> On 8/17/2010 2:29 PM, Lance Norskog wrote:
>> I think 'bq=' is what you want. In dismax the main query string is
>> assumed to go against a bunch of fields. This query is in the standard
>> (Lucene++) format. The query strings should handle the ^number syntax.
>> On Tue, Aug 17, 2010 at 9:40 AM, Shawn Heisey<>  wrote:
>>>   On 4/9/2010 7:35 PM, Lance Norskog wrote:
>>>> Function queries are notoriously slow. Another way to boost by year is
>>>> with range queries:
>>>> [NOW-6MONTHS TO NOW]^5.0 ,
>>>> [* TO NOW-2YEARS]^1.0
>>>> Notice that you get to have a non-linear curve when you select the
>>>> ranges by hand.
>>> Lance, I have worked out my major issue and now have my post date in 
>>> Solr as
>>> a tdate field named "pd."  I cannot however figure out how to 
>>> actually send
>>> a query with a date boost like you've mentioned above.  I'd like to 
>>> embed it
>>> right into the dismax handler definition, but it would be good to 
>>> also know
>>> how to send it in a query myself.  Can you help?
>>> Are the boosts indicated above a multiplier, or an addition?

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