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https://issues.apache.org/jira/browse/LUCENE-1785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12790284#action_12790284
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Jason Rutherglen commented on LUCENE-1785:
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bq. Can't we just merge-sort into the merged StringIndex? 

Right however what's going to be the fastest way to remove terms that are no 
longer in the index?  

> Simple FieldCache merging
> -------------------------
>
>                 Key: LUCENE-1785
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1785
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>    Affects Versions: 2.4.1
>            Reporter: Jason Rutherglen
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: LUCENE-1785.patch, LUCENE-1785.patch, LUCENE-1785.patch, 
> LUCENE-1785.patch
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> We'll merge the field caches in RAM as the SegmentReader's are
> merged in IndexWriter (the first cut will work in conjunction
> with IW.getReader). There will be an optional callback to
> determine which fields to merge. 

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