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https://issues.apache.org/jira/browse/SOLR-5211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16498627#comment-16498627
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Yonik Seeley commented on SOLR-5211:
------------------------------------

It should be relatively trivial to know if the \_root\_ field exists in the 
index (i.e. when any parent/child groups exist) and do the right thing based on 
that.


 

 

 

> updating parent as childless makes old children orphans
> -------------------------------------------------------
>
>                 Key: SOLR-5211
>                 URL: https://issues.apache.org/jira/browse/SOLR-5211
>             Project: Solr
>          Issue Type: Sub-task
>          Components: update
>    Affects Versions: 4.5, 6.0
>            Reporter: Mikhail Khludnev
>            Assignee: Mikhail Khludnev
>            Priority: Major
>         Attachments: SOLR-5211.patch
>
>
> if I have parent with children in the index, I can send update omitting 
> children. as a result old children become orphaned. 
> I suppose separate \_root_ fields makes much trouble. I propose to extend 
> notion of uniqueKey, and let it spans across blocks that makes updates 
> unambiguous.  
> WDYT? Do you like to see a test proves this issue?



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