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From Håvard Wahl Kongsgård <haavard.kongsga...@gmail.com>
Subject Re: Boosting on field-not-empty
Date Thu, 30 Oct 2014 20:52:09 GMT
Thanks :)

On Thu, Oct 30, 2014 at 7:49 PM, Ramzi Alqrainy <ramzi.alqrainy@gmail.com>
wrote:

> You can use FunctionQuery that allows one to use the actual value of a
> field
> and functions of those fields in a relevancy score.
>
> Two function will help you, which are :
>
> *exists*
>
> exists(field|function) returns true if a value exists for a given document.
>
> Example use: exists(myField) will return true if myField has a value, while
> exists(query({!v='year:2012'})) will return true for docs with year=2012.
>
> *if*
>
> if(expression,trueValue,falseValue) emits trueValue if the expression is
> true, else falseValue. An expression can be any function which outputs
> boolean values, or even functions returning numeric values, in which case
> value 0 will be interpreted as false, or strings, in which case empty
> string
> is interpreted as false.
>
> Example use: if(exists(myField),100,0) returns 100 if myField exists
>
> *Solution: *
>
> Use in a parameter that is explicitly for specifying functions, such as the
> EDisMax query parser's boost param, or DisMax query parser's bf (boost
> function) parameter. (Note that the bf parameter actually takes a list of
> function queries separated by white space and each with an optional boost.
> Make sure you eliminate any internal white space in single function queries
> when using bf). For example:
>
> <
> http://lucene.472066.n3.nabble.com/file/n4166709/Screen_Shot_2014-10-30_at_9.png
> >
>
>
>
>
> --
> View this message in context:
> http://lucene.472066.n3.nabble.com/Boosting-on-field-not-empty-tp4166692p4166709.html
> Sent from the Solr - User mailing list archive at Nabble.com.
>

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