[jira] [Updated] (LUCENE-7537) Add multi valued field support to index sorting

["Ferenczi Jim (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ferenczi Jim updated LUCENE-7537:
---------------------------------
    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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