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https://issues.apache.org/jira/browse/SOLR-1814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12843632#action_12843632
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Ted Dunning commented on SOLR-1814:
-----------------------------------
Trove is GPL.
The Mahout project has a partial set of replacements for Trove collections in
case you want to go forward with this. Our plan is to consider breaking out
the collections package from Mahout at some point in case you don't want to
drag along the rest of Mahout.
> select count(distinct fieldname) in SOLR
> ----------------------------------------
>
> Key: SOLR-1814
> URL: https://issues.apache.org/jira/browse/SOLR-1814
> Project: Solr
> Issue Type: New Feature
> Components: SearchComponents - other
> Affects Versions: 1.4, 1.5, 1.6, 2.0
> Reporter: Marcus Herou
> Fix For: 1.4, 1.5, 1.6, 2.0
>
> Attachments: CountComponent.java
>
>
> I have seen questions on the mailinglist about having the functionality for
> counting distinct on a field. We at Tailsweep as well want to that in for
> example our blogsearch.
> Example:
> "You had 1345 hits on 244 blogs"
> The 244 part is not possible in SOLR today (correct me if I am wrong). So
> I've written a component which does this. Attaching it.
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