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https://issues.apache.org/jira/browse/LUCENE-7537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15647779#comment-15647779
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Michael McCandless commented on LUCENE-7537:
--------------------------------------------
Hmm, I think we can take an alternate approach that does not add need to add
new {{SortField.Type}} enum values, by extending {{IWC.setIndexSort]} to also
allow {{SortedSetSortField}} and {{SortedNumericSortField}}?
When serializing, we would need to check for those specific classes, and also
serialize/deserialize their selectors.
> 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
> Attachments: 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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