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https://issues.apache.org/jira/browse/SOLR-1632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12856517#action_12856517
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Yonik Seeley commented on SOLR-1632:
------------------------------------

Rewrite not working through function query is not the end of the problems 
either... there is also stuff like extractTerms.

There is also the issue of Lucene changing rapidly... and the difficulty of 
adding new methods to ValueSource and making sure that all implementations 
correctly propagate them through to sub ValueSources.  Perhaps one idea is to 
use a visitor pattern to decouple tree traversal with the operations being 
performed.

> Distributed IDF
> ---------------
>
>                 Key: SOLR-1632
>                 URL: https://issues.apache.org/jira/browse/SOLR-1632
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 1.5
>            Reporter: Andrzej Bialecki 
>         Attachments: distrib-2.patch, distrib.patch
>
>
> Distributed IDF is a valuable enhancement for distributed search across 
> non-uniform shards. This issue tracks the proposed implementation of an API 
> to support this functionality in Solr.

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