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https://issues.apache.org/jira/browse/SOLR-6280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16616241#comment-16616241
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Munendra S N commented on SOLR-6280:
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[^SOLR-6280.patch]
Fixed the failing test in QueryEqualityTest.
> Collapse QParser should give error for multiValued field
> --------------------------------------------------------
>
> Key: SOLR-6280
> URL: https://issues.apache.org/jira/browse/SOLR-6280
> Project: Solr
> Issue Type: Improvement
> Components: search
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Minor
> Attachments: SOLR-6280.patch, SOLR-6280.patch
>
>
> The Collapse QParser does give results if you collapse on a multi-valued
> field, but the document->value is somewhat arbitrarily chosen based on the
> internals of the FieldCache (FieldCacheImpl.SortedDocValuesCache).
> Note that the Grouping functionality accesses values via
> FieldType.getValueSource which is a layer of abstraction above that includes
> a multiValued error check.
> Collapse should throw an error here.
> p.s. easy to test with exampledocs collapsing on "cat"
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