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https://issues.apache.org/jira/browse/SOLR-7296?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley updated SOLR-7296:
-------------------------------
    Summary: Reconcile faceting implementations  (was: Reconcile facetting 
implementations)

I fixed the typo in the title; it was taking me _forever_ to find this issue -- 
even with http://jirasearch.mikemccandless.com/

I took a deeper look at the new Facet Module (ported from Heliosearch) and I 
like it a whole lot!  I wish I had done the heatmap faceting stuff there; it 
would have saved me some grief.  I have more advanced heatmap analytics planned 
and I will do it in the Facet module not just because I like the API better but 
because I'll need to leverage the analytics there.  It mainly needs internal 
javadocs.  It's important to note that it's both a _framework_ for doing 
faceting, and it has some implementations of the various types that plug into 
that framework.  By comparison, FacetComponent & SimpleFacets has no real 
framework and isn't something we should substantially improve going forward, 
IMO.  In principle, I don't see why Lucene's facet module couldn't be used here 
as well as an implementation (ala facet.method=?), plugging into Solr's new 
Facet module. I'm not saying it's trivial but my point is that this shouldn't 
be an either-or; it's complementary.  Let the Facet Module be the framework, 
have implementations plug-in, and put the JSON parse & standard/classic request 
param parsing a layer above.

I haven't looked at the Analytics Contrib module but it's lack of distributed 
support is likely a non-starter, and it's not clear what capabilities lie there 
that aren't in the new Facet Module.

> Reconcile faceting implementations
> ----------------------------------
>
>                 Key: SOLR-7296
>                 URL: https://issues.apache.org/jira/browse/SOLR-7296
>             Project: Solr
>          Issue Type: Task
>          Components: faceting
>            Reporter: Steve Molloy
>
> SOLR-7214 introduced a new way of controlling faceting, the unmbrella 
> SOLR-6348 brings a lot of improvements in facet functionality, namely around 
> pivots. Both make a lot of sense from a user perspective, but currently have 
> completely different implementations. With the analytics components, this 
> makes 3 implementation of the same logic, which is bound to behave 
> differently as time goes by. We should reconcile all implementations to ease 
> maintenance and offer consistent behaviour no matter how parameters are 
> passed to the API.



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