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https://issues.apache.org/jira/browse/SOLR-4319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16056400#comment-16056400
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Michael Schumann commented on SOLR-4319:
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This would be nice. We achieved this behavior by always doing a "remove" before
an "add"; if no value exists the remove has no effect.
> New atomic update operation: AddToSet
> -------------------------------------
>
> Key: SOLR-4319
> URL: https://issues.apache.org/jira/browse/SOLR-4319
> Project: Solr
> Issue Type: Wish
> Components: Schema and Analysis
> Reporter: Mikael Koskinen
> Labels: atomic
>
> Currently Solr supports the following atomic operations:
> add, set, inc
> It would be great to have operation "addToSet". This would be useful in
> situations where a document has a multivalued field (like category) and I
> want to add a new value to list if it doesn't already exists.
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