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https://issues.apache.org/jira/browse/SOLR-1682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Yonik Seeley updated SOLR-1682:
-------------------------------

    Attachment: SOLR-1682_prototype.patch

Here's an early prototype of mine, updated to trunk.  It's designed to 
collapsing on an arbitrary function (value source).  It only implements the 
first-phase level-1 collapsing, and assumes a single comparator for simplicity.

The previous patches here (which I've just now started looking at) look pretty 
solid.  It's surprising how similar the first level collapse is (how a single 
field comparator group used for everything, defer building the treeset, etc).

I have some time to work on this now... I think I'll approach it by merging 
this patch with mine, working on getting a single collapse option working well 
enough to commit.  The original SOLR-236 is simply too big and it feels like 
there are too many options to grapple with at the same time.


> 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_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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