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https://issues.apache.org/jira/browse/SOLR-5536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13916081#comment-13916081
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Joel Bernstein commented on SOLR-5536:
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Hi Peter,
There were a couple of jiras for the CollapsingQParserPlugin being worked on at
once while this ticket was being developed. So the patch here likely built upon
changes committed on other tickets. So it's best to look at the commits that
were done in svn for the CollapsingQParserPlugin and merge them in order into
your branch.
Joel
> 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
> Assignee: Joel Bernstein
> Priority: Minor
> Fix For: 4.7, 5.0
>
> Attachments: SOLR-5536-edited.patch, SOLR-5536.patch,
> SOLR-5536.patch, SOLR-5536.patch, 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 "cscore", 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 cscore usage:
> {code}
> fq={!collapse field=collapse_field max=sum(cscore(), field(x))}
> {code}
>
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