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https://issues.apache.org/jira/browse/SOLR-6168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15006906#comment-15006906
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Steve Rowe commented on SOLR-6168:
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ASF Jenkins found a reproducible NPE in a new test committed under this issue -
see SOLR-8295
> enhance collapse QParser so that "group head" documents can be selected by
> more complex sort options
> ----------------------------------------------------------------------------------------------------
>
> Key: SOLR-6168
> URL: https://issues.apache.org/jira/browse/SOLR-6168
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 4.7.1, 4.8.1
> Reporter: Umesh Prasad
> Assignee: Hoss Man
> Fix For: 5.4, Trunk
>
> Attachments: CollapsingQParserPlugin-6168.patch.1-1stcut,
> SOLR-6168-group-head-inconsistent-with-sort.patch, SOLR-6168.patch,
> SOLR-6168.patch, SOLR-6168.patch, SOLR-6168.patch, SOLR-6168.patch
>
>
> The fundemental goal of this issue is add additional support to the
> CollapseQParser so that as an alternative to the existing min/max localparam
> options, more robust sort syntax can be used to sort on multiple criteria
> when selecting the "group head" documents used to represent each collapsed
> group.
> Since support for arbitrary, multi-clause, sorting is almost certainly going
> to require more RAM then the existing min/max functionaly, this new
> functionality should be in addition to the existing min/max localparam
> implementation, not a replacement of it.
> (NOTE: early comments made in this jira may be confusing in historical
> context due to the way this issue was originally filed as a bug report)
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