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https://issues.apache.org/jira/browse/SOLR-13970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16994194#comment-16994194
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ASF subversion and git services commented on SOLR-13970:
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Commit 88b5b5a7cd7cb0d763206bdc39ee9eda3b54ce31 in lucene-solr's branch
refs/heads/master from Munendra S N
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=88b5b5a ]
SOLR-13970: disallow using collapse/expand with grouping
* Using collapse with grouping would cause inconsistent behavior.
This is because grouping calls the same postfilter twice without
resetting the internal state of the DocValues cache
* Using expand with grouping would cause NPE
> Collapse/Expand and Grouping are not designed to work together, we should
> fail requests that specify both gracefully
> --------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-13970
> URL: https://issues.apache.org/jira/browse/SOLR-13970
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Erick Erickson
> Assignee: Munendra S N
> Priority: Major
> Attachments: SOLR-13970.patch, SOLR-13970.patch, SOLR-13970.patch,
> SOLR-13970.patch
>
>
> Expand/Collapse was conceived as orthogonal to grouping, and there are odd
> interactions when both are specified. If these two options are specified, we
> should reject the query with an informative message.
> Shorter term, making this explicit in the documents would be helpful.
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