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https://issues.apache.org/jira/browse/SOLR-1682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12899401#action_12899401
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Yonik Seeley commented on SOLR-1682:
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bq. Groups are sorted by the first and most relevant document in a group.
Going back to a specific example... assuming we are sorting by price asc within
a single group, but sorting groups by popularity desc (however that's defined).
So we have 2 sane choices about what the popularity of a group is:
1) the popularity of a group is the lowest price doc (i.e. the first in the
list for that group). - this is what you did
2) the popularity of a group is the max among all docs in that group
I wonder which will be more useful to people? Do we need both?
#2 can be trivially implemented with the existing collectors (just use
different sorts at the different stages)
> Implement CollapseComponent
> ---------------------------
>
> Key: SOLR-1682
> URL: https://issues.apache.org/jira/browse/SOLR-1682
> Project: Solr
> Issue Type: Sub-task
> Components: search
> Reporter: Martijn van Groningen
> Assignee: Shalin Shekhar Mangar
> Fix For: Next
>
> Attachments: field-collapsing.patch, SOLR-1682.patch,
> SOLR-1682.patch, SOLR-1682.patch, SOLR-1682.patch, SOLR-1682_prototype.patch,
> SOLR-1682_prototype.patch, SOLR-1682_prototype.patch, SOLR-236.patch
>
>
> Child issue of SOLR-236. This issue is dedicated to field collapsing in
> general and all its code (CollapseComponent, DocumentCollapsers and
> CollapseCollectors). The main goal is the finalize the request parameters and
> response format.
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