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https://issues.apache.org/jira/browse/LUCENE-3433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121840#comment-13121840
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Martijn van Groningen commented on LUCENE-3433:
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bq. I think sorting and grouping by string fields are first class functions for
Lucene.
And faceting too!
Maybe we should have DocTermIndex that is independent of source and have impls
for DV and impls for indexed values.
Maybe the name DocTermIndex doesn't make sense then, because it suggests that
values come from the inverted index which might not be the case.
> Random access non RAM resident IndexDocValues (CSF)
> ---------------------------------------------------
>
> Key: LUCENE-3433
> URL: https://issues.apache.org/jira/browse/LUCENE-3433
> Project: Lucene - Java
> Issue Type: New Feature
> Affects Versions: 4.0
> Reporter: Yonik Seeley
> Assignee: Simon Willnauer
> Fix For: 4.0
>
> Attachments: LUCENE-3433.patch, LUCENE-3433.patch, LUCENE-3433.patch,
> sorted_source.patch
>
>
> There should be a way to get specific IndexDocValues by going through the
> Directory rather than loading all of the values into memory.
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