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https://issues.apache.org/jira/browse/LUCENE-7590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15743089#comment-15743089
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Shai Erera commented on LUCENE-7590:
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bq. Let's implement the computation of these stats by writing a Collector and
use a MatchAllDocsQuery?
At first I thought this is an overkill, but a {{Collector}} will allow
computing them for documents that match another query. I will explore that
option.
bq. Why is missing undefined when count is zero?
I thought that if you have no documents in the index at all, then {{missing}}
is undefined, but now that you ask the question, I guess in that case it's fine
if it's {{0}}, like {{count}}. I'll change the docs.
> 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
>
>
> 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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