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From "Bill Bell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-2242) Get distinct count of names for a facet field
Date Mon, 06 Jun 2011 06:24:47 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044727#comment-13044727
] 

Bill Bell commented on SOLR-2242:
---------------------------------

Since we changed the output of the facet_fields, the FacetComponent.java needs to change.
This also impacts the DistribFieldFacet type. This code is not going to work, since price
does not just have a list of numbers. It now has multiple lists (if we set the param). We
might want to always return "counts" list in all cases. Then sharding can easily pick up on
this... The DistribFieldFacet needs to be refactored.

{code}
<lst name="facet_fields">
  <lst name="price">
    <int name="numFacetTerms">14</int>
    <lst name="counts"><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>
</lst>
{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.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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