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https://issues.apache.org/jira/browse/SOLR-2242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13006782#comment-13006782
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Jonathan Rochkind commented on SOLR-2242:
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There is clearly a semantic problem here. i call that the number of 'facet
values', what you are calling a 'name' I am calilng a 'facet value'. I have no
idea what you are calling a 'value', honestly. I'm pretty sure we're talking
about the same thing. I have no idea what word to use that will mean that to
both of us and everyone else.
I guess what you are calling 'number of values',if I understand properly, I'd
call 'sum of the facet counts'. facet counts are already called facet counts.
Summing them up is the sum of them. It's not a 'number of values'. (I also
can't imagine any use case where you'd want a sum of facet counts; for a
single-valued field with no facet.missing, the sum of the facet counts will
equal the document count, numRows. In other cases it may not, and I have no
idea why you'd ever want it in those cases). But the name is less important
than the functionality, I guess. (Except for that lack of establishment of
consistent terminology in Solr is what leads us to this confusion). Okay, wait,
numFacetTerms, is that maybe clear, 'terms', since Solr 'terms' is in fact what
appear as the values/names in Solr facetting? From the wiki page for
facet.field: "It will iterate over each Term in the field and generate a facet
count using that Term as the constraint. "
But also perhaps I misunderstood, the functionality is of use/interest to me
only if it does NOT require me to set facet.limit=-1 to get this count of
distinct values/names/terms. If I'm setting facet.limit=-1 anyway, that number
is already implicit in the response, not much value added making it explicit.
What I have need of is a way to get this number without setting facet.limit=-1,
since in my use cases I can have a million or more, um, values/names/terms.
(Which Solr 1.4.1 with facet.method=fc handles with aplomb!). If your patch
only works if facet.limit=-1, it does not actually address my need.
> 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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