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From "Lance Norskog (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-2242) Get distinct count of names for a facet field
Date Mon, 13 Jun 2011 05:50:52 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13048474#comment-13048474
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Lance Norskog commented on SOLR-2242:
-------------------------------------

If I was a committer which I'm not, I would demand:
* params would be as simple as possible. 'namedistinct' would be a symbol like 'facet.method=enum'.
Facets have exploded in complexity, and I can't follow how everything interlocks. The API
may have to change later.
* no white-space glitches
* consistencyConsistencyConsistency. 
* there has to to be a way to use less memory when we're only pulling a count.
* unit tests. It's somewhat unfair to expect you to write all the unit tests required to make
sure this does not break anything else, give that so much of facet features do not have tests.

Anyway, food calls. Hope this helps.

> 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
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: SOLR-2242.patch, SOLR-2242.shard.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?q=*:*&facet=true&facet.field=manu&facet.mincount=1&facet.limit=-1&f.manu.facet.namedistinct=0&facet.field=price&f.price.facet.namedistinct=1
> Here is an example on field "hgid" (without namedistinct):
> {code}
> - <lst name="facet_fields">
> - <lst name="hgid">
>   <int name="HGPY0000045FD36D4000A">1</int> 
>   <int name="HGPY00000FBC6690453A9">1</int> 
>   <int name="HGPY00001E44ED6C4FB3B">1</int> 
>   <int name="HGPY00001FA631034A1B8">1</int> 
>   <int name="HGPY00003317ABAC43B48">1</int> 
>   <int name="HGPY00003A17B2294CB5A">5</int> 
>   <int name="HGPY00003ADD2B3D48C39">1</int> 
>   </lst>
>   </lst>
> {code}
> With namedistinct (HGPY0000045FD36D4000A, HGPY00000FBC6690453A9, HGPY00001E44ED6C4FB3B,
HGPY00001FA631034A1B8, HGPY00003317ABAC43B48, HGPY00003A17B2294CB5A, HGPY00003ADD2B3D48C39).
This returns number of rows (7), not the number of values (11).
> {code}
> - <lst name="facet_fields">
> - <lst name="hgid">
>   <int name="_count_">7</int> 
>   </lst>
>   </lst>
> {code}
> This works actually really good to get total number of fields for a group.field=hgid.
Enjoy!

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