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https://issues.apache.org/jira/browse/LUCENE-3403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13091739#comment-13091739
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Michael McCandless commented on LUCENE-3403:
--------------------------------------------
Phew nice catch Shai!
> Term vectors missing after addIndexes + optimize
> ------------------------------------------------
>
> Key: LUCENE-3403
> URL: https://issues.apache.org/jira/browse/LUCENE-3403
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 3.3
> Reporter: Shai Erera
> Assignee: Shai Erera
> Priority: Blocker
> Fix For: 3.4, 4.0
>
> Attachments: LUCENE-3403.patch
>
>
> I encountered a problem with addIndexes where term vectors disappeared
> following optimize(). I wrote a simple test case which demonstrates the
> problem. The bug appears with both addIndexes() versions, but does not appear
> if addDocument is called twice, committing changes in between.
> I think I tracked the problem down to IndexWriter.mergeMiddle() -- it sets
> term vectors before merger.merge() was called. In the addDocs case,
> merger.fieldInfos is already populated, while in the addIndexes case it is
> empty, hence fieldInfos.hasVectors returns false.
> will post a patch shortly.
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