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https://issues.apache.org/jira/browse/SOLR-2242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13072732#comment-13072732
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Bill Bell commented on SOLR-2242:
---------------------------------
To make this work right with distribution, if seems that it might be more
complicated... Wouldn't you have to send the full list of facet terms,
consolidate them, and then loop to get the distinct number? That is why I
originally sent the WHOLE list of facets, and just added the magic number to
the end.
One machine:
male: 10000
numFacetTerms: 1
Another machine:
female: 7000
male: 500
numFacetTerms: 2
The numFacetTerms that we want is 2. Since if you combined them and looped you
get 2:
male: 10500
female: 7000
numFacetTerms: 2
If we add numFacetTerms you get 1+2 = 3.
The other 2 are easier:
distribMaxTerms: 2
distribSumTerms: 3
This is not ideal but may be acceptable, the perfect solution is to send the
whole list, dedupe them, and then count.... Thoughts?
> 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
> Assignee: Simon Willnauer
> Priority: Minor
> Fix For: 4.0
>
> Attachments: NumFacetTermsFacetsTest.java,
> SOLR-2242-notworkingtest.patch, SOLR-2242.patch, SOLR-2242.patch,
> SOLR-2242.shard.patch, SOLR-2242.shard.patch,
> SOLR-2242.shard.withtests.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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