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https://issues.apache.org/jira/browse/LUCENE-3232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054350#comment-13054350
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Michael McCandless commented on LUCENE-3232:
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OK this sounds like a good plan... if we can get FQs factored out soonish then
we can simply fix grouping module to use that (ie, we don't need common module
to hold the ValueSource, etc.).
I guess we keep the name "common" for now. Maybe as we slurp in more stuff
from Solr I'll like the name better :)
> Move MutableValues to Common Module
> -----------------------------------
>
> Key: LUCENE-3232
> URL: https://issues.apache.org/jira/browse/LUCENE-3232
> Project: Lucene - Java
> Issue Type: Sub-task
> Components: core/search
> Reporter: Chris Male
> Fix For: 4.0
>
> Attachments: LUCENE-3232.patch, LUCENE-3232.patch
>
>
> Solr makes use of the MutableValue* series of classes to improve performance
> of grouping by FunctionQuery (I think). As such they are used in ValueSource
> implementations. Consequently we need to move these classes in order to move
> the ValueSources.
> As Yonik pointed out, these classes have use beyond just FunctionQuerys and
> might be used by both Solr and other modules. However I don't think they
> belong in Lucene core, since they aren't really related to search
> functionality. Therefore I think we should put them into a Common module,
> which can serve as a dependency to Solr and any module.
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