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https://issues.apache.org/jira/browse/LUCENE-4258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13650734#comment-13650734
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Shai Erera commented on LUCENE-4258:
------------------------------------

I upgraded branch to trunk. Sivan, I get many NPEs from tests like 
TestFieldReplacements. The NPEs come from FrozenBufferedDeletes which I had 
some difficulty merging. The NPEs are caused because 'deletes' are null. I 
checked trunk code, and FrozenBufferedDeletes assumes they are not null (as in 
the branch), so either I broke something while merging, or something has 
changed in trunk that the updates code doesn't respect. Can you take a look?
                
> Incremental Field Updates through Stacked Segments
> --------------------------------------------------
>
>                 Key: LUCENE-4258
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4258
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/index
>            Reporter: Sivan Yogev
>             Fix For: 4.3
>
>         Attachments: IncrementalFieldUpdates.odp, 
> LUCENE-4258-API-changes.patch, LUCENE-4258.branch.1.patch, 
> LUCENE-4258.branch.2.patch, LUCENE-4258.branch3.patch, 
> LUCENE-4258.r1410593.patch, LUCENE-4258.r1412262.patch, 
> LUCENE-4258.r1416438.patch, LUCENE-4258.r1416617.patch, 
> LUCENE-4258.r1422495.patch, LUCENE-4258.r1423010.patch
>
>   Original Estimate: 2,520h
>  Remaining Estimate: 2,520h
>
> Shai and I would like to start working on the proposal to Incremental Field 
> Updates outlined here (http://markmail.org/message/zhrdxxpfk6qvdaex).

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