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https://issues.apache.org/jira/browse/SOLR-12249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16876665#comment-16876665
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ASF subversion and git services commented on SOLR-12249:
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Commit 48b026d5eedcfa2090596639dd5282fac18db40a in lucene-solr's branch
refs/heads/master from Munendra S N
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=48b026d ]
SOLR-13404: Fix NPE when group=true and no group.field is present
* This was introduced in SOLR-12249
> Better error message when grouping on a tokenized (non SortableText) field in
> SolrCloud
> ---------------------------------------------------------------------------------------
>
> Key: SOLR-12249
> URL: https://issues.apache.org/jira/browse/SOLR-12249
> Project: Solr
> Issue Type: Bug
> Affects Versions: 6.6.2, 8.0
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Priority: Minor
> Fix For: master (9.0), 8.2
>
> Attachments: SOLR-12249.patch
>
>
> 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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