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https://issues.apache.org/jira/browse/SOLR-5211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16694222#comment-16694222
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David Smiley commented on SOLR-5211:
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Moshe and I iterated a bit on the linked PR and I think it's ready. Proposed
CHANGES.txt as follows under Improvements:
{noformat}
If _root_ is defined in the schema, it is now always populated automatically.
This allows documents with children to be updated with a document that does not
have children, whereas before it would break block-join queries. If you don't
use nested documents then _root_ can be removed as always.
{noformat}
I plan to commit tomorrow to master only. I'll have my laptop with me over
Thanksgiving holidays in case there are issues.
> 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: David Smiley
> Priority: Blocker
> Fix For: master (8.0)
>
> Attachments: SOLR-5211.patch, SOLR-5211.patch, SOLR-5211.patch
>
> Time Spent: 3h
> Remaining Estimate: 0h
>
> 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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