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https://issues.apache.org/jira/browse/LUCENE-3079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13055570#comment-13055570
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Robert Muir commented on LUCENE-3079:
-------------------------------------
{quote}
I guess what I'm aiming for is for our users to get this feature soon. And I'm
afraid that putting it in a branch will only delay it.
{quote}
+1
My suggestion:
# commit to branch 3.x with @experimental.
# next, do a "fast" port to trunk, this doesnt mean heavy refactoring to take
advantage of things like docvalues, just get it working correctly on trunk's
APIs.
# finally, close this issue and do improvements as normal, backporting
whichever ones are easy and make sense, like any other issue.
> Facetiing module
> ----------------
>
> Key: LUCENE-3079
> URL: https://issues.apache.org/jira/browse/LUCENE-3079
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Michael McCandless
> Attachments: LUCENE-3079.patch, LUCENE-3079.patch, LUCENE-3079.patch
>
>
> Faceting is a hugely important feature, available in Solr today but
> not [easily] usable by Lucene-only apps.
> We should fix this, by creating a shared faceting module.
> Ideally, we factor out Solr's faceting impl, and maybe poach/merge
> from other impls (eg Bobo browse).
> Hoss describes some important challenges we'll face in doing this
> (http://markmail.org/message/5w35c2fr4zkiwsz6), copied here:
> {noformat}
> To look at "faceting" as a concrete example, there are big the reasons
> faceting works so well in Solr: Solr has total control over the
> index, knows exactly when the index has changed to rebuild caches, has a
> strict schema so it can make sense of field types and
> pick faceting algos accordingly, has multi-phase distributed search
> approach to get exact counts efficiently across multiple shards, etc...
> (and there are still a lot of additional enhancements and improvements
> that can be made to take even more advantage of knowledge solr has because
> it "owns" the index that we no one has had time to tackle)
> {noformat}
> This is a great list of the things we face in refactoring. It's also
> important because, if Solr needed to be so deeply intertwined with
> caching, schema, etc., other apps that want to facet will have the
> same "needs" and so we really have to address them in creating the
> shared module.
> I think we should get a basic faceting module started, but should not
> cut Solr over at first. We should iterate on the module, fold in
> improvements, etc., and then, once we can fully verify that cutting
> over doesn't hurt Solr (ie lose functionality or performance) we can
> later cutover.
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