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https://issues.apache.org/jira/browse/SOLR-5292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13783123#comment-13783123
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Shawn Heisey commented on SOLR-5292:
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In terms of functionality, probably no difference at all. And it might turn
out that there's even no possibility of a performance increase from skipping
the rest of the code in the method. If this patch doesn't get used because it
offers no benefit, I'm OK with that.
> Add SKIP_MUTATE_SINGLETON to FieldValueMutatingUpdateProcessor
> --------------------------------------------------------------
>
> Key: SOLR-5292
> URL: https://issues.apache.org/jira/browse/SOLR-5292
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 4.5
> Reporter: Shawn Heisey
> Assignee: Shawn Heisey
> Priority: Minor
> Fix For: 5.0, 4.6
>
> Attachments: SOLR-5292.patch
>
>
> While trying to solve a problem, I came up with something that didn't work
> for what I was trying to do, but seemed like it might be useful for somebody.
> This allows somebody to decide during the course of a mutateValue method
> that they'd rather skip the mutate entirely - leave the source field value
> completely unchanged.
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