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https://issues.apache.org/jira/browse/SOLR-13970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16992822#comment-16992822
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Joel Bernstein commented on SOLR-13970:
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Let's definitely get something committed that stops people from combining
collapse and grouping.
I think if possible we should throw the exception from inside the
CollapsingQParserPlugin. I believe we should be able to do this.
I'll work on a patch for this today.
> 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
>
>
> 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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