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https://issues.apache.org/jira/browse/LUCENE-5297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13812488#comment-13812488
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Michael McCandless commented on LUCENE-5297:
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+1, patch looks good!
> Allow rang faceting on any ValueSource
> --------------------------------------
>
> Key: LUCENE-5297
> URL: https://issues.apache.org/jira/browse/LUCENE-5297
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/facet
> Reporter: Shai Erera
> Attachments: LUCENE-5297.patch
>
>
> Today RangeAccumulator assumes the ranges should be read from a
> NumericDocValues field. Would be good if we can modify it, or introduce a new
> ValueSourceAccumulator which allows you to range-facet on any ValueSource,
> e.g. one that is generated from an expression.
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