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https://issues.apache.org/jira/browse/LUCENE-4765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13579804#comment-13579804
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Robert Muir commented on LUCENE-4765:
-------------------------------------
For the disk codec I did a simple solution of writing the entire ordinal stream
as block-packed on disk.
The indexes to this stream are loaded into memory (MonotonicBlockPacked). I
think this is a pretty good tradeoff
that might work reasonably well for this codec: we can always think of
alternative encodings.
> 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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