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https://issues.apache.org/jira/browse/LUCENE-5345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13827829#comment-13827829
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Shai Erera commented on LUCENE-5345:
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Or, we could modify the test to use a custom ValueSource which mimics
expression's behavior (not encoding the double as long, but just casting).
> range facets don't work with float/double fields
> ------------------------------------------------
>
> Key: LUCENE-5345
> URL: https://issues.apache.org/jira/browse/LUCENE-5345
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/facet
> Reporter: Michael McCandless
> Fix For: 5.0, 4.7
>
> Attachments: LUCENE-5345.patch
>
>
> With LUCENE-5297 we generalized range faceting to accept a ValueSource.
> But, when I tried to use this to facet by distance (< 1 km, < 2 km, etc.),
> it's not working ... the problem is that the RangeAccumulator always uses
> .longVal and assumes this was a double encoded as a long (via DoubleField).
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