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https://issues.apache.org/jira/browse/LUCENE-1981?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tom Hill updated LUCENE-1981:
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Attachment: lucene-1981.patch
Here's a sample implementation. There are a number of possible ways to do this,
but this seemed pretty minimally invasive.
Adds one method to IndexReader and subclasses.
> 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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