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From Walter Underwood <wun...@wunderwood.org>
Subject Re: How to implement a custom boost function
Date Tue, 04 Oct 2016 03:51:19 GMT
How about sorting them after you get them back from Solr?

wunder
Walter Underwood
wunder@wunderwood.org
http://observer.wunderwood.org/  (my blog)


> On Oct 3, 2016, at 6:45 PM, Lucas Cotta <luccotta@gmail.com> wrote:
> 
> I actually could also use a custom similarity class that always returns 1.0
> then I could use small boost factors such as ^1, ^2, ^3, etc.
> 
> But I want to do this only in some specific queries (that may contain other
> fields besides studentId)
> 
> How could I do this, use the custom similarity class only for some queries?
> Is it possible?
> 
> Thanks!
> 
> 2016-10-03 19:49 GMT-03:00 Lucas Cotta <luccotta@gmail.com>:
> 
>> Hello,
>> 
>> I'm new in Solr (4.7.2) and I was given the following requirement:
>> 
>> Given a query such as:
>> 
>> studentId:(875141 OR 873071 OR 875198 OR 108142 OR 918841 OR 870688 OR
>> 107920 OR 870637 OR 870636 OR 870635 OR 918792 OR 107721 OR 875078 OR
>> 875166 OR 875151 OR 918829 OR 918808)
>> 
>> I want the results to be ordered by the same order the elements were
>> informed in the query. This would be similar to MySQL's ORDER BY
>> FIELD(id, 3,2,5,7,8,1).
>> 
>> I have tried to use term boosting
>> <https://wiki.apache.org/solr/SolrRelevancyCookbook#Boosting_Ranking_Terms>
>> in the query but that only works when I use big factors like this: 875078^100000
>> OR 875166^10000 OR 875151^1000 OR 918829^100OR 918808^10
>> 
>> But that would cause the query to be too big in case I have 200 ids for
>> instance.
>> 
>> So it seems I need to implement a custom FunctionQuery.
>> I'm a little lost on how to do that. Could someone please give me an idea?
>> Which classes should my custom class extend from? Where should I place this
>> class? Should I add to Solr project it self and regenerate the JAR?
>> 
>> Thanks
>> 


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