[jira] [Commented] (LUCENE-7590) Add DocValues statistics helpers

["Michael McCandless (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-7590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15741562#comment-15741562 ] 

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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