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Date: Sat, 25 Jan 2014 00:54:38 +0000 (UTC)
From: "Peng Cheng (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <JIRA.12691166.1390611020151.10084.1390611278288@arcas>
In-Reply-To: <JIRA.12691166.1390611020151@arcas>
References: <JIRA.12691166.1390611020151@arcas>
Subject: [jira] [Commented] (LUCENE-5417) Solr function query supports
 reading multiple values from a field.
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    [ https://issues.apache.org/jira/browse/LUCENE-5417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13881570#comment-13881570 ] 

Peng Cheng commented on LUCENE-5417:
------------------------------------

I didn't check the issue history and am not sure if this problem has been solved, please revoke this one if its a duplicate.

> Solr function query supports reading multiple values from a field.
> ------------------------------------------------------------------
>
>                 Key: LUCENE-5417
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5417
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: core/query/scoring
>    Affects Versions: 4.6
>         Environment: N/A
>            Reporter: Peng Cheng
>            Priority: Minor
>             Fix For: 4.7
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> Solr function query is a powerful tool to customize search criterion and ranking function (http://wiki.apache.org/solr/FunctionQuery). However, it cannot effectively benefit from field values from multi-valued field, namely, the field(...) function can only read one value and discard the others.
> This limitation has been associated with FieldCacheSource, and the fact that FieldCache cannot fetch multiple values from a field, but such constraint has been largely lifted by LUCENE-3354, which allows multiple values to be extracted from one field. Those values in turn can be used as parameters of other functions to yield a single score.
> I personally find this limitation very unhandy when building a learning-to-rank system that uses many cues and string features. Therefore I would like to post this feature request and (hopefully) work on it myself.


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