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

["Shai Erera (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7590?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shai Erera updated LUCENE-7590:
-------------------------------
    Attachment: LUCENE-7590.patch

First patch adds numeric statistics. I'd appreciate comments about it before I add support for sorted-numeric (including, whether we should!).

Note that I chose to take either a field or {{ValueSource}}. The latter gives some flexibility by allowing users to pass an arbitrary VS over e.g. an {{Expression}} over a numeric DV field.

This, as far as I could tell, does not apply to {{SortedNumericDV}}, or at least I couldn't find an existing {{ValueSource}} implementation (like {{LongFieldSource}}) for {{SortedNumericDV}}.

If this approach looks good, I'd like to refactor the class so that it's easy to share/reuse code between Long and Double NDV fields.

> 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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