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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-9279) Add greater than, less than, etc in Solr function queries
Date Thu, 25 Aug 2016 13:27:21 GMT

    [ https://issues.apache.org/jira/browse/SOLR-9279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15436849#comment-15436849
] 

David Smiley commented on SOLR-9279:
------------------------------------

Documented in ref guide: https://cwiki.apache.org/confluence/display/solr/Function+Queries
 (after refactoring out the boolean functions into a separate table)

> Add greater than, less than, etc in Solr function queries
> ---------------------------------------------------------
>
>                 Key: SOLR-9279
>                 URL: https://issues.apache.org/jira/browse/SOLR-9279
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: search
>            Reporter: Doug Turnbull
>            Assignee: David Smiley
>             Fix For: 6.2
>
>         Attachments: SOLR-9279.patch
>
>
> If you use the "if" function query, you'll often expect to be able to use greater than/less
than functions. For example, you might want to boost books written in the past 7 years. Unfortunately,
there's no "greater than" function query that will return non-zero when the lhs > rhs.
Instead to get this, you need to create really awkward function queries like I do here (http://opensourceconnections.com/blog/2014/11/26/stepwise-date-boosting-in-solr/):
> if(min(0,sub(ms(mydatefield),sub(ms(NOW),315569259747))),0.8,1)
> The pull request attached to this Jira adds the following function queries
> (https://github.com/apache/lucene-solr/pull/49)
> -gt(lhs, rhs) (returns 1 if lhs > rhs, 0 otherwise)
> -lt(lhs, rhs) (returns 1 if lhs < rhs, 0 otherwise)
> -gte
> -lte
> -eq
> So instead of 
> if(min(0,sub(ms(mydatefield),sub(ms(NOW),315569259747))),0.8,1)
> one could now write
> if(lt(ms(mydatefield),315569259747,0.8,1)
> (if mydatefield < 315569259747 then 0.8 else 1)
> A bit more readable and less puzzling



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