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https://issues.apache.org/jira/browse/LUCENE-3232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13053826#comment-13053826
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Michael McCandless commented on LUCENE-3232:
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Patch looks great!
I wonder if we should name this module something more specific, eg docvalues?
values?
Should we also move over ValueSource, *DocValues, FieldCacheSource? I think,
then, Solr 3.x grouping could cutover and then group by other field types.
> 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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