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https://issues.apache.org/jira/browse/SOLR-6168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14036081#comment-14036081
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Joel Bernstein commented on SOLR-6168:
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Umesh,
The group head selection is independent of the sort criteria with the
CollapsingQParserPlugin. So it's working as designed. Let's close this ticket
out and move the discussion to the users list. I'd like to look closely at your
use case and see if we can come up with a way to make it work with how the
CollapsingQParserPlugin currently operates.
> CollapsingQParserPlugin ranks incorrectly when 3 or more sort params are used
> -----------------------------------------------------------------------------
>
> Key: SOLR-6168
> URL: https://issues.apache.org/jira/browse/SOLR-6168
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.7.1, 4.8.1
> Reporter: Umesh Prasad
> Assignee: Joel Bernstein
> Attachments: SOLR-6168-group-head-inconsistent-with-sort.patch
>
>
> CollapsingQParser Plugin ranks documents incorrectly when more than 2 sort
> fields are used.
> I have attached a test case, which demonstrates the broken behavior when 3
> sort fields are used.
> The failing test case patch is against Lucene/Solr 4.8.1 revision number
> 1603061
> PS : SOLR-5408 fixed the issue with sorting only for two sort fields, by
> allowing one to specify max/min=<field-name>. However that requires 2nd sort
> field to be a numeric field. It will not work with string field or function
> query sort.
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