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https://issues.apache.org/jira/browse/LUCENE-7590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15741562#comment-15741562
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Michael McCandless commented on LUCENE-7590:
--------------------------------------------
Thanks [~shaie].
Maybe instead of a new stepping-stone class that the user must invoke,
{{DocsAndContexts}}, you could just define a functional interface:
{noformat}
(LeafReaderContext ctx) -> DocIdSetIterator
{noformat}
And then maybe instead of a new class that computes stats in its ctor,
{{NumericLongDocValuesStats}}, you could offer a static method instead, taking
a top-level reader and the above function, that computes the stats and returns
a results class holding the min/max/mean/etc.? Seems like that might be a
simpler way to expose the functionality...
> 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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