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https://issues.apache.org/jira/browse/LUCENE-5173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13738344#comment-13738344
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Michael McCandless commented on LUCENE-5173:
--------------------------------------------

+1, I like consolidating the logic into a single shouldMerge().

And I don't think codecs should be required to handle the 0 doc segment case: 
we should never send such a segment to them.
                
> Add checkindex piece of LUCENE-5116
> -----------------------------------
>
>                 Key: LUCENE-5173
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5173
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Robert Muir
>         Attachments: LUCENE-5173.patch
>
>
> LUCENE-5116 fixes addIndexes(Reader) to never write a 0-document segment (in 
> the case you merge in empty or all-deleted stuff).
> I considered it just an inconsistency, but it could cause confusing 
> exceptions to real users too if there was a "regression" here. (see solr 
> users list:Split Shard Error - maxValue must be non-negative). 

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