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https://issues.apache.org/jira/browse/SOLR-1351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12754506#action_12754506
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Uri Boness commented on SOLR-1351:
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This is something that I've done in the far past (Solr 1.2) and they way I see
it, facets should be identified by a unique idea rather than by the field name
and the facet results will then be grouped by these ids. I think this can be
done by just adding one extra parameter in the form:
{code}
f.<fieldName>.facet.id
{code}
This parameter will practically mean that all other specific parameter for
field facet will need to use this id instead of the field name, that is:
Assuming we have a field called "cat" to represent a category. Right now
(without an id) we ca do:
{code}
q=*:*&facet=true&facet.field=cat&f.cat.facet.sort=true&f.cat.facet.limit=20&f.cat.facet.mincount=1
{code}
with introducing the id:
{code}
q=*:*&facet=true&facet.field=cat&f.cat.facet.id=category&f.category.facet.sort=true&f.category.facet.limit=20&f.category.facet.mincount=1
{code}
Now to support multiple "configurations":
{code}
q=*:*&facet=true&facet.field=cat&f.cat.facet.id=cat1&f.cat1.facet.sort=true&f.cat1.facet.limit=20&f.cat1&facet.mincount=1&f.cat.facet.id=cat2&f.cat2.facet.sort=false&f.cat2.facet.count=0
{code}
Note that even after introducing the id param, backward compatibility can
easily be maintained - we just determine that when the id param is not
specified, the field name is the default id.
>From experience, I can tell you that adding this feature not only will enable
>multiple facets on the same field, but IMO will also make it much easier to
>develop search clients and tools on top of Solr.
If this solution sounds reasonable, I can start working on a patch for it.
> facet on same field different ways
> ----------------------------------
>
> Key: SOLR-1351
> URL: https://issues.apache.org/jira/browse/SOLR-1351
> Project: Solr
> Issue Type: Improvement
> Reporter: Yonik Seeley
> Fix For: 1.5
>
>
> There is a general need to facet on the same field in different ways
> (different prefixes, different filters). We need a way to express this.
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