[jira] [Updated] (LUCENE-4765) Multi-valued docvalues field

["Robert Muir (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-4765?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir updated LUCENE-4765:
--------------------------------

    Attachment: LUCENE-4765.patch

Here's a prototype patch just to explore the idea.

I only implemented this for Lucene42Codec (just uses FST + vint-encoded byte[] as a quick hack).

We should try to think about what would be the best API and so on if we want to add this.
                
> Multi-valued docvalues field
> ----------------------------
>
>                 Key: LUCENE-4765
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4765
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Robert Muir
>         Attachments: LUCENE-4765.patch
>
>
> The general idea is basically the docvalues parallel to FieldCache.getDocTermOrds/UninvertedField
> Currently this stuff is used in e.g. grouping and join for multivalued fields, and in solr for faceting.

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