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https://issues.apache.org/jira/browse/SOLR-11267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16397721#comment-16397721
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David Smiley commented on SOLR-11267:
-------------------------------------

bq. It's already in 7.3 branch

Wonderful.  There was a missed commit into JIRA then, so I was confused as to 
the status (not to mention the issue hasn't been resolved)

> Add support for "add-distinct" atomic update operation
> ------------------------------------------------------
>
>                 Key: SOLR-11267
>                 URL: https://issues.apache.org/jira/browse/SOLR-11267
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Ishan Chattopadhyaya
>            Assignee: Noble Paul
>            Priority: Blocker
>             Fix For: 7.3
>
>         Attachments: SOLR-11267.patch, SOLR-11267.patch, SOLR-11267.patch
>
>
> Often, a multivalued field is used as a set of values. Since multivalued 
> fields are more like lists than sets, users do two consecutive operations, 
> remove and add, to insert an element into the field and also maintain the 
> set's property of only having unique elements.
> Proposing a new single operation, called "add-distinct" (which essentially 
> means "add-if-doesn't exist") for this.



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