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https://issues.apache.org/jira/browse/LUCENE-1785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12790366#action_12790366
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Michael McCandless commented on LUCENE-1785:
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Hmm good question. Actually, couldn't we pull a Term(s)Enum from the newly
merged segment for that field, and use it to eliminate the non-dead terms?
> 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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