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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-2242) Get distinct count of names for a facet field
Date Tue, 15 Mar 2011 01:05:29 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13006750#comment-13006750
] 

Yonik Seeley commented on SOLR-2242:
------------------------------------

It feels like we should have an option to return the number of constraints that match the
criteria (mincount, etc) w/o having to specify facet.limit=-1, and you should be able to get
this info in addition to the normal facet counts.  We can also improve the efficiency by not
building the complete list in memory just to return it's count.

We've also talked before about having an extra metadata level for each facet.

Current:
{code}
"facet fields" : {"hgid" : ["constraint",10,...]}
{code}

Proposed:
{code}
"facet fields" : {"hgid" : {
  "missing" : 25,
  "constraints" : 1250,
  "counts" : ["constraint",10,...]
}}
{code}

> 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-distinctFacet.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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