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https://issues.apache.org/jira/browse/LUCENE-7590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15741572#comment-15741572
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Uwe Schindler commented on LUCENE-7590:
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I would not even define an own functional interface, just use
{{java.util.function.Function<LeafReaderContext,DocIdSetIterator>}}:
https://docs.oracle.com/javase/8/docs/api/java/util/function/Function.html
This only works if the function does not throw checked exceptions. Otherwise a
new functional interface is needed.
> Add DocValues statistics helpers
> --------------------------------
>
> Key: LUCENE-7590
> URL: https://issues.apache.org/jira/browse/LUCENE-7590
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/misc
> Reporter: Shai Erera
> Assignee: Shai Erera
> Attachments: LUCENE-7590.patch
>
>
> I think it can be useful to have DocValues statistics helpers, that can allow
> users to query for the min/max/avg etc. stats of a DV field. In this issue
> I'd like to cover numeric DV, but there's no reason not to add it to other DV
> types too.
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