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https://issues.apache.org/jira/browse/LUCENE-4412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13461320#comment-13461320
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Chris Male commented on LUCENE-4412:
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One of the big challenges for this API is the issue of multiple-values.
Applying a function to two lots of multiple-values is different as you begin to
run into order problems and issue of what to do when the cardinalities are
different.
> Reconsider FunctionValues / ValueSource API
> -------------------------------------------
>
> Key: LUCENE-4412
> URL: https://issues.apache.org/jira/browse/LUCENE-4412
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/other
> Reporter: Chris Male
> Fix For: 5.0
>
>
> When documenting a lot of these classes today I found myself confused and it
> isn't the first time with this API.
> I think we need to step back and reassess what we want from this API, what
> use cases its designed to meet, and redesign it from the ground up.
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