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From "Erick Erickson (Commented) (JIRA)" <>
Subject [jira] [Commented] (SOLR-2242) Get distinct count of names for a facet field
Date Tue, 27 Dec 2011 02:04:31 GMT


Erick Erickson commented on SOLR-2242:

Just to be clear. I'm not volunteering to actually *implement* this patch. I'll gladly guide
it through the process if someone wants to work on it and address the concerns raised. And
I'll keep prodding it along and try to keep it from dying on the vine, and certainly volunteer
to test various incarnations. Or I'll try to kill it if it comes to that.

There are two open issues really, of which the most pressing seems to be back-compat. Cody's
initial suggestion doesn't work with all the various response formats. Working out a way to
change the response format without breaking back-compat seems like a worthy goal in itself,
but does that mean we need to create another JIRA for that and make this JIRA dependent on
the new one? Note that this is the inverse of my original point <3>, I'm suggesting
we fix the back-compat issue before we address this one. I have no real clue yet how to approach
that mind you.

Again, I want a clear goal in mind before we put work into *any* solution.
> Get distinct count of names for a facet field
> ---------------------------------------------
>                 Key: SOLR-2242
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>          Components: Response Writers
>    Affects Versions: 4.0
>            Reporter: Bill Bell
>            Assignee: Erick Erickson
>            Priority: Minor
>             Fix For: 4.0
>         Attachments:, SOLR-2242-notworkingtest.patch, SOLR-2242.patch,
SOLR-2242.patch, SOLR-2242.patch, SOLR-2242.shard.patch, SOLR-2242.shard.patch, SOLR-2242.shard.withtests.patch,
SOLR-2242.solr3.1-fix.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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