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Posted to dev@lucene.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2016/08/02 01:08:21 UTC
[jira] [Commented] (SOLR-9279) Add greater than, less than, etc in
Solr function queries
[ https://issues.apache.org/jira/browse/SOLR-9279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15403153#comment-15403153 ]
ASF subversion and git services commented on SOLR-9279:
-------------------------------------------------------
Commit d12b93e2729036b0c04621114429c25739499243 in lucene-solr's branch refs/heads/apiv2 from [~dsmiley]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=d12b93e ]
SOLR-9279: new function queries: gt, gte, lt, lte, eq
Lucene Queries module: new ComparisonBoolFunction base class
> 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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