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https://issues.apache.org/jira/browse/LUCENE-7537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ferenczi Jim updated LUCENE-7537:
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Attachment: LUCENE-7537.patch
Here is a simple patch that adds the support for multi valued sort directly in
SortField. It defines 5 new sort types: sorted_string, sorted_long,
sorted_double, sorted_float, sorted_int and uses the
Sorted{Set|Numeric}Selector for sorting. The natural order picks the minimum
value of the list for each document and the reverse order picks the maximum.
This patch also fixes a small bug which showed up in unit tests when using an
index sorting with reverse sort and a missing value.
> 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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