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https://issues.apache.org/jira/browse/LUCENE-7537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15634242#comment-15634242
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Michael McCandless commented on LUCENE-7537:
--------------------------------------------

I think this makes sense.

It seems like we just need to handle serializing of {{SortedSetSortField}} and 
{{SortedNumericSortField}}, with their selectors, as well?

> 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
>
> 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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