[jira] [Updated] (LUCENE-7899) Add "exists" query for doc values

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

     [ https://issues.apache.org/jira/browse/LUCENE-7899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless updated LUCENE-7899:
---------------------------------------
    Fix Version/s:     (was: 7.1)
                   7.0

> Add "exists" query for doc values
> ---------------------------------
>
>                 Key: LUCENE-7899
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7899
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 7.0
>
>
> I don't think we have a query today to efficiently test whether a doc values field exists (has any value) for each document in the index?
> Now that we use iterators to access doc values, this should be an efficient query: we can return the DISI we get for the doc values.
> ElasticSearch indexes its own field to record which field names occur in a document, so it's able to do "exists" for any field (not just doc values fields), but I think doc values fields we can just get "for free".
> I haven't started on this ... just wanted to open the issue first for discussion.



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