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https://issues.apache.org/jira/browse/SOLR-153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12921337#action_12921337
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Yonik Seeley commented on SOLR-153:
-----------------------------------

Hmmm, yes, their "Bitset Tree" is what I've done here.
It looks like my work pre-dates their work, but I guess they were unaware of 
this issue.

> Facet Index
> -----------
>
>                 Key: SOLR-153
>                 URL: https://issues.apache.org/jira/browse/SOLR-153
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Yonik Seeley
>         Attachments: facettree.patch, facettree.patch
>
>
> A facet index, initially for non-hierarchical facets.
> Start with all terms, and a set of documents for each term.  Group lower 
> level nodes by taking the union of the sets, but keep track of the largest 
> set going back all the way to the leaves (the max doc-freq for that node).

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