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https://issues.apache.org/jira/browse/SOLR-3073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196159#comment-13196159
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Yonik Seeley commented on SOLR-3073:
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I assume the results of TopGroupsResultTransformer is never exposed to the end
user (i.e. the end user won't know that we use strings internally)? If so,
this fix seems easiest. If not, then UUIDField itself should be fixed to not
return a UUID from toObject.
> Distributed Grouping fails if the uniqueKey is a UUID
> -----------------------------------------------------
>
> Key: SOLR-3073
> URL: https://issues.apache.org/jira/browse/SOLR-3073
> Project: Solr
> Issue Type: Bug
> Affects Versions: 3.5
> Reporter: Devon Krisman
> Priority: Minor
> Fix For: 3.6
>
> Attachments: SOLR-3073-3x.patch, SOLR-3073-3x.patch
>
>
> Attempting to use distributed grouping (using a StrField as the
> group.fieldname) with a UUID as the uniqueKey results in an error because the
> classname (java.util.UUID) is prepended to the field value during the second
> phase of the grouping.
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