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https://issues.apache.org/jira/browse/LUCENE-3433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121172#comment-13121172
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Robert Muir commented on LUCENE-3433:
-------------------------------------
{quote}
This value type is useful for apps that want to sort by string field,
without paying the high uninversion-on-reader-init that you now pay
(to use FieldCache). Grouping should also cutover to this (away
from FieldCache).
{quote}
I think this is bogus? If you have high-turnaround/NRT you are gonna pay the
price to uninvert somewhere,
so it doesnt matter where you do it.
If you don't, then you shouldnt be closing your IndexReader and reopening the
same one again.
+1 to drop SortedSource
> 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
> Fix For: 4.0
>
> Attachments: LUCENE-3433.patch, LUCENE-3433.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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