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https://issues.apache.org/jira/browse/LUCENE-7590?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shai Erera updated LUCENE-7590:
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    Attachment: LUCENE-7590.patch

[~jpountz] I accept your proposal about missing, only in case a reader does not 
have the requested DV field, the collector returns a {{LeafCollector}} which 
updates {{missing}} for every hit document.

I also renamed the classes as proposed earlier, as well extracted 
{{DocValuesStats}} and friends to its own class.

I still didn't address changing {{DocValuesIterator}} to public. BTW, I noticed 
that {{SimpleTextDocValuesReader}} defines a private class named 
{{DocValuesIterator}} with exactly the same signature, I assume because the 
other one is package-private. So I feel that changing {{DVI}} to public is 
beneficial beyond the scope of this issue alone. What do you think?

> 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, LUCENE-7590.patch, LUCENE-7590.patch, 
> LUCENE-7590.patch, LUCENE-7590.patch, 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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