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https://issues.apache.org/jira/browse/SOLR-9279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15366396#comment-15366396
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ASF GitHub Bot commented on SOLR-9279:
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Github user softwaredoug commented on the issue:
https://github.com/apache/lucene-solr/pull/49
Renaming is a good idea. I can push that up. ComparisonFunction?
On Thu, Jul 7, 2016 at 12:13 PM David Smiley <[email protected]>
wrote:
> I think after addressing the comments I just added, it's probably good to
> go. I still don't love the name, especially since it extends BoolFunction
> it ought to now end with Function.
>
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> 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
> Fix For: master (7.0)
>
>
> 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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