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https://issues.apache.org/jira/browse/SOLR-153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12921489#action_12921489
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Peter Karich commented on SOLR-153:
-----------------------------------

> That's really the only case where our existing algorithms fall down. 

but that is quite common ... like in my case ;-)
hmmh, I will see if I have time.

This is one line where I need to replace the 'old intersection' with the new 
one which uses the precalculated tree:

c = searcher.numDocs(new TermQuery(t), docs, deState);

right?

But I don't understand the part where where df > minDfFilterCache ... What is a 
'(Multi)DocsEnum' ? I'll investigate this!

> 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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