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https://issues.apache.org/jira/browse/LUCENE-7537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15670747#comment-15670747
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ASF subversion and git services commented on LUCENE-7537:
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Commit 64b9eefaa931b4fc8b2345e2307eff4a317e3450 in lucene-solr's branch
refs/heads/branch_6x from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=64b9eef ]
LUCENE-7537: fix some 6.x backport issues
> Add multi valued field support to index sorting
> -----------------------------------------------
>
> Key: LUCENE-7537
> URL: https://issues.apache.org/jira/browse/LUCENE-7537
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Reporter: Ferenczi Jim
> Fix For: master (7.0), 6.4
>
> Attachments: LUCENE-7537.patch, LUCENE-7537.patch, LUCENE-7537.patch,
> LUCENE-7537.patch, LUCENE-7537.patch
>
>
> Today index sorting can be done on single valued field through the
> NumericDocValues (for numerics) and SortedDocValues (for strings).
> I'd like to add the ability to sort on multi valued fields. Since index
> sorting does not accept custom comparator we could just take the minimum
> value of each document for an ascending sort and the maximum value for a
> descending sort.
> This way we could handle all cases instead of throwing an exception during a
> merge when we encounter a multi valued DVs.
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