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