[jira] [Commented] (SOLR-5536) Add ValueSource collapse criteria to CollapsingQParsingPlugin

["Joel Bernstein (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-5536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13840942#comment-13840942 ] 

Joel Bernstein commented on SOLR-5536:
--------------------------------------

Initial patch, generated from trunk, adds the ValueSource collapse criteria to the CollapsingQParserPlugin.

The collapseScore function query is not yet included.



> Add ValueSource collapse criteria to CollapsingQParsingPlugin
> -------------------------------------------------------------
>
>                 Key: SOLR-5536
>                 URL: https://issues.apache.org/jira/browse/SOLR-5536
>             Project: Solr
>          Issue Type: Improvement
>          Components: search
>    Affects Versions: 4.6
>            Reporter: Joel Bernstein
>            Priority: Minor
>             Fix For: 5.0, 4.7
>
>         Attachments: SOLR-5536.patch
>
>
> It would be useful for the CollapsingQParserPlugin to support ValueSource collapse criteria.
> Proposed syntax:
> {code}
> fq={!collapse field=collapse_field max=value_source}
> {code}
> This ticket will also introduce a function query called "collapseScore",  which will return the score of the current document being collapsed. This will allow score to be incorporated into collapse criteria functions.
> A simple example of the collapseScore usage:
> {code}
> fq={!collapse field=collapse_field max=sum(collapseScore(), field(x))}
> {code}
>  



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