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https://issues.apache.org/jira/browse/SOLR-12249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16445247#comment-16445247
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Erick Erickson commented on SOLR-12249:
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I think these are related-but-separate.
> Grouping on a solr.TextField works in stand-alone but not in SolrCloud
> ----------------------------------------------------------------------
>
> Key: SOLR-12249
> URL: https://issues.apache.org/jira/browse/SOLR-12249
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 6.6.2, master (8.0)
> Reporter: Erick Erickson
> Priority: Minor
>
> I didn't test this with master. Under the covers in stand-alone mode, the
> "min" function is silently substituted for the grouping, but that's not true
> in SorlCloud mode. I broke this JIRA out separately to discuss whether it
> _ever_ makes sense to group by a tokenized text field.
> Grouping by the min value in a field is at least consistent, but on a text
> field I don't think it makes sense.
> I propose that we explicitly dis-allow this in both stand-alone and Cloud
> mode, especially now that there's the SortableTextField.
> Comments?
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