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https://issues.apache.org/jira/browse/SOLR-2564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044867#comment-13044867
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Yonik Seeley commented on SOLR-2564:
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bq. > The other use-case is more like field collapsing and does change what
documents match (basically, only the first documents in each group, up to
limit, "match").
bq. I'm not sure it's that simple, ie that we can so cleanly model collapsing
as reducing the docs to consider and then running faceting on that reduced set.
I *think* that's what was actually implemented in SOLR-236 IIRC, and what some
people seem to be asking for.
bq. EG, the use case of getting correct facet counts for a field that has
different values within the group, can't be handled by this approach?
Well, correct is a matter of context ;-) (for example, some have called the
facet counts for the current grouping implementation "incorrect" because it
didn't happen to match their use case). Looking at the original description in
LUCENE-3097, it seems you're talking about Martijn's 3rd method, while I was
talking about the 2nd. But maybe some people that were originally advocating
for #2, really wanted #3?
> Integrating grouping module into Solr 4.0
> -----------------------------------------
>
> Key: SOLR-2564
> URL: https://issues.apache.org/jira/browse/SOLR-2564
> Project: Solr
> Issue Type: Improvement
> Reporter: Martijn van Groningen
> Assignee: Martijn van Groningen
> Fix For: 4.0
>
> Attachments: LUCENE-2564.patch, SOLR-2564.patch, SOLR-2564.patch,
> SOLR-2564.patch, SOLR-2564.patch
>
>
> Since work on grouping module is going well. I think it is time to wire this
> up in Solr.
> Besides the current grouping features Solr provides, Solr will then also
> support second pass caching and total count based on groups.
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