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https://issues.apache.org/jira/browse/LUCENE-5116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713582#comment-13713582
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Robert Muir commented on LUCENE-5116:
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so maybe only the empty segment special case exists? If you have an all-deleted
one, it should have already been pruned... I think :)
But we should be able to fake one with a FilterReader if we really want...
> IW.addIndexes doesn't prune all deleted segments
> ------------------------------------------------
>
> Key: LUCENE-5116
> URL: https://issues.apache.org/jira/browse/LUCENE-5116
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-5116_test.patch
>
>
> at the least, this can easily create segments with maxDoc == 0.
> It seems buggy: elsewhere we prune these segments out, so its expected to
> have a commit point with no segments rather than a segment with 0 documents...
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