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https://issues.apache.org/jira/browse/SOLR-2242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13070935#comment-13070935
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Chris Male commented on SOLR-2242:
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Having walked through the SimpleFacet codebase, I see
PerSegmentSingleValuedFaceting has already introduced a FacetCollector. I
think we should take this and make it used throughout all the different
faceting 'Strategies'. That way we can push the counting of constraints into
the Collector.
I've also thought about the distribution issue. The simplest option seems to
be to return the max constraint count taken from all the shards. With this, no
matter if shards have distinct or overlapping constraints sets, clients can
alway see this as the minimum number of constraints that do exist.
> Get distinct count of names for a facet field
> ---------------------------------------------
>
> Key: SOLR-2242
> URL: https://issues.apache.org/jira/browse/SOLR-2242
> Project: Solr
> Issue Type: New Feature
> Components: Response Writers
> Affects Versions: 4.0
> Reporter: Bill Bell
> Assignee: Simon Willnauer
> Priority: Minor
> Fix For: 4.0
>
> Attachments: NumFacetTermsFacetsTest.java,
> SOLR-2242-notworkingtest.patch, SOLR-2242.patch, SOLR-2242.patch,
> SOLR-2242.shard.patch, SOLR-2242.shard.patch,
> SOLR-2242.shard.withtests.patch, SOLR-2242.solr3.1.patch,
> SOLR.2242.solr3.1.patch, SOLR.2242.v2.patch
>
>
> When returning facet.field=<name of field> you will get a list of matches for
> distinct values. This is normal behavior. This patch tells you how many
> distinct values you have (# of rows). Use with limit=-1 and mincount=1.
> The feature is called "namedistinct". Here is an example:
> http://localhost:8983/solr/select?shards=localhost:8983/solr,localhost:7574/solr&indent=true&q=*:*&facet=true&facet.mincount=1&facet.numFacetTerms=2&facet.limit=-1&facet.field=price
> http://localhost:8983/solr/select?shards=localhost:8983/solr,localhost:7574/solr&indent=true&q=*:*&facet=true&facet.mincount=1&facet.numFacetTerms=0&facet.limit=-1&facet.field=price
> http://localhost:8983/solr/select?shards=localhost:8983/solr,localhost:7574/solr&indent=true&q=*:*&facet=true&facet.mincount=1&facet.numFacetTerms=1&facet.limit=-1&facet.field=price
> This currently only works on facet.field.
> {code}
> <lst name="facet_fields">
> <lst name="price">
> <int name="numFacetTerms">14</int>
> <int name="0.0">3</int><int name="11.5">1</int><int
> name="19.95">1</int><int name="74.99">1</int><int name="92.0">1</int><int
> name="179.99">1</int><int name="185.0">1</int><int name="279.95">1</int><int
> name="329.95">1</int><int name="350.0">1</int><int name="399.0">1</int><int
> name="479.95">1</int><int name="649.99">1</int><int name="2199.0">1</int>
> </lst>
> </lst>
> {code}
> Several people use this to get the group.field count (the # of groups).
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