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https://issues.apache.org/jira/browse/LUCENE-1981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12765157#action_12765157
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Yonik Seeley commented on LUCENE-1981:
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We shouldn't tie IndexReader/SegmentReader to the fieldCache.
All of the public APIs already exist to use the FieldCache instead of
document().
> Allow access to entries in the field cache
> ------------------------------------------
>
> Key: LUCENE-1981
> URL: https://issues.apache.org/jira/browse/LUCENE-1981
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Search
> Affects Versions: 2.9
> Reporter: Tom Hill
> Priority: Minor
> Attachments: lucene-1981.patch
>
>
> If the data required is already in the field cache, it seems unnecessary to
> go to the disk for it, if the data is already in RAM.
> We have a case where we need one field from a large number (500 -1000) of
> scattered documents in a fairly large index (50-100m docs), and seek time to
> collect the data from disk is prohibitive, so we'd like to grab the data from
> the cache, instead.
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